X by the numbers: what the platform will say, and what it will not

You remember the number Twitter gave out every quarter. Monetizable daily active users. The company called them mDAU. A person who logged in and saw an ad. Twitter counted them and published the count. It did that from 2019 until the platform went private. Then the numbers stopped.

Four years passed. In May 2026 a number appeared. Not from X. From SpaceX. The rocket company filed to go public. Its business depends on an AI division that runs on X's infrastructure. So the prospectus named a user count. 550 million monthly active users. That included people using Grok, the AI feature. It was the first SEC filing to carry an X user metric since Elon Musk took over.

The number sits below what Musk said a year earlier. In May 2024 he wrote that X had 600 million monthly users. No filing backed that one up. The SpaceX document gave the first figure a regulator required someone to stand behind.

That gap tells the shape of the problem. X publishes less than Twitter did. What gets published now comes in different units. Some of it arrives sideways, through a filing about rockets. The rest comes from vendor estimates. Firms that guess at the revenue by watching the market. Their method gets disclosed. The result is still a guess. Other platforms are easier to check. Meta still reports to investors on a schedule, which is why Instagram's user counts and time-spent figures can be traced to a document. X's cannot.

This post reads what X and its owner will say on the record. It reads what vendors with disclosed methods estimate. And it names what has no source at all. Every source below is linked, dated and quoted.

The last number Twitter published as a public company

Start with what we know for certain. Twitter filed quarterly reports with the SEC. It reported a metric it invented. Monetizable daily active users. People who logged in on a day and could be shown an ad. The company reported the count every quarter. Until it stopped being a public company.

The last quarter it reported was Q2 2022. It filed on July 22, 2022. That was three months before Musk bought it. The press release said this:

mDAU was 237.8 million for Q2, compared to 238.0 million in the prior quarter and 206.0 million in the same period of the previous year, representing an increase of 16% year-over-year. — Twitter Inc., Twitter Announces Second Quarter 2022 Results, 22 July 2022

The count for the US was 41.5 million. For the rest of the world, 196.3 million. Twitter broke it down that way every time.

Revenue for that quarter was $1.18 billion. Down 1% from a year earlier. Advertising revenue was $1.08 billion of that total. The company blamed the decline on two things. The economy. And uncertainty around the pending sale to Musk.

For full year 2021, Twitter reported total revenue of $5.08 billion. Advertising made up $4.51 billion of that. Twitter announced those numbers on February 10, 2022. Eight months before Musk closed the purchase.

That gives the baseline. 237.8 million daily users who saw ads. $1.18 billion in quarterly revenue. $4.51 billion in annual ad revenue the year before. Those are the last figures Twitter published under SEC rules.

The acquisition, and what changed after it

Musk bought Twitter for $44 billion. The deal closed on October 27, 2022. Twitter stock was delisted. It became a private company. Private companies do not have to file quarterly results. X has not filed any since.

The count went away. So did the quarterly revenue disclosure. The company renamed itself X Corp. It moved the parent entity to Nevada. What we know now comes from three places. A few statements Musk has made. One piece of a SpaceX filing. And UK financial filings, because UK law requires them.

Musk said X reached 600 million monthly active users. He posted that on May 26, 2024. He said about half were daily users. No filing confirmed it. It was a post on the platform, not a number in a regulatory document.

In late 2024 Fidelity marked down its stake in X. Fidelity helped finance the purchase in 2022. It values that stake every month. By September 2024 it valued X at 79% less than the purchase price. That puts the platform at about $9.4 billion. One-fifth what Musk paid. Then in October 2024 Fidelity marked it up by 32%. The overall decline from purchase price stayed above 70%.

The SpaceX filing: the first SEC-disclosed user count in four years

SpaceX filed to go public. It filed an S-1 registration statement on May 20, 2026. The filing described SpaceX's AI segment. That segment includes xAI, the company building Grok. Grok runs on X's servers. So the filing disclosed X's infrastructure and users.

The user figures come from March 2026. Here is what the filing said. 550 million monthly active users across X and Grok combined. Of those, 117 million used Grok features. That leaves 433 million using X without Grok. The filing also said 1.3 billion accounts were active over the prior twelve months. And about 350 million posts per day.

That 550 million is the number to hold. It is lower than what Musk claimed in May 2024. He said 600 million then. The SpaceX filing was 8% below that. The filing went to the SEC. It carries more weight than a post.

The filing also disclosed paid subscribers. 6.3 million total in March 2026. That split into 4.4 million X subscribers and 1.9 million Grok subscribers.

The metric changed. Twitter reported daily users who could see ads. X now reports monthly users across two products. You cannot compare 550 million monthly to 237.8 million daily. A monthly count is always bigger. Someone who logs in once a month gets counted. Twitter's old metric only counted people who logged in that day. So the 550 million tells you the ceiling got higher. It does not tell you how many show up each day.

One other number dropped between those years. Daily posts. Twitter said in March 2023 that the platform saw about 500 million tweets per day. That came from a blog post about opening the recommendation algorithm. The post said this:

Twitter aims to deliver you the best of what's happening in the world right now. This requires a recommendation algorithm to distill the roughly 500 million Tweets posted daily down to a handful of top Tweets that ultimately show up on your device's For You timeline. — X Corp, A new era of transparency for Twitter, 31 March 2023

The SpaceX filing three years later said 350 million posts per day. That is a 30% drop from what the company stated in 2023. Fewer people posting. Or the same people posting less.

The advertising decline: UK filings and vendor estimates

X does not publish global revenue. It publishes nothing for the US. But UK law requires companies operating there to file accounts. X Corp's UK entity filed in January 2026. Those accounts cover the year ending December 31, 2024.

The UK filing showed revenue of $39.8 million in 2024. That compared to $95.2 million in 2023. A 58% drop in one year. The 2023 figure itself was down 66% from $282.9 million in 2022. The company's own filing blamed the decline on advertisers leaving. It named brand safety and content moderation as the reasons.

So UK revenue fell from $282.9 million in 2022 to $39.8 million in 2024. That is an 86% decline over two years. One market, but a clear direction.

For global numbers, we rely on estimates. eMarketer is a research firm that forecasts advertising revenue. It discloses its method. It watches the market and models spending. The result is not a measurement. It is a forecast.

eMarketer estimated X's global ad revenue in 2023 at $2.98 billion. That estimate came in April 2023. It was a sharp cut from the $4.74 billion eMarketer had projected before Musk took over. The firm cited declining trust in the platform.

For 2024, eMarketer estimated about $1.7 billion in ad revenue. For 2025, it estimated $1.8 billion. That would be a 7% increase from 2024. But still down 60% from Twitter's actual reported ad revenue of $4.51 billion in 2021.

Those are the vendor estimates with disclosed methods. Other numbers circulate. They have no disclosed sample or method. We do not report them.

What the numbers say together

Put it in a line. Twitter reported $4.51 billion in ad revenue for 2021. It had 237.8 million daily users who saw ads in Q2 2022. Musk bought it for $44 billion in October 2022. By 2024, vendor estimates put global ad revenue at $1.7 billion. The UK operation fell 86% over two years. Daily posting volume dropped 30% from 2023 to 2026. And the one investor disclosing a valuation marked the company down 79% before a partial rebound.

The SpaceX filing gave the first audited user count. 550 million monthly users. That number counts differently than Twitter's old metric. It includes a new product. It measures a month, not a day. So it does not prove the user base grew or shrank. It proves X changed what it counts.

Revenue is simpler. Every estimate points down. The UK filing is not an estimate. It is required disclosure. It dropped 86% in two years. The global vendor estimates show the same direction. They put 2024 ad revenue at less than 40% of what Twitter reported in 2021.

The posting volume drop is harder to read. It could mean fewer users posting. Or the same users posting less. Or the measure changing. X has not said. But 500 million posts per day in 2023 became 350 million in 2026. That is a fact from two company statements.

What this does not tell you

This does not tell you whether X is better or worse as a product. Revenue and user counts measure the business. They do not measure whether the thing works for the people using it.

It does not tell you daily active users. The SpaceX filing gave monthly users. Twitter used to report daily. You cannot turn one into the other without knowing how often people return.

It does not tell you profit or loss. X is private. It files nothing about that. The SpaceX filing disclosed losses for xAI, the division that includes Grok. It reported a $6.4 billion operating loss on $3.2 billion in revenue for fiscal 2025. That includes more than X alone. The filing does not break out X's own profit or loss.

It does not tell you what Musk thinks success looks like. He has said the platform is not about revenue. He has said it is about free speech. If that is the goal, ad revenue is not the measure. But we cannot measure free speech with a number from a filing. So we measure what gets disclosed.

Where the claims without sources sit

Some numbers get repeated with no primary source behind them. We list them here so you know what has no backing.

Total valuation claims beyond Fidelity. Many outlets report X is worth $9.4 billion or similar figures. Those come from one source. Fidelity's markdown of its own stake. Fidelity invested $19.66 million in 2022. It valued that stake at about $4.18 million in July 2024. That is a 79% drop. Apply that percentage to the $44 billion purchase price and you get $9.4 billion. But Fidelity only disclosed its own stake. It did not value the whole company. The $9.4 billion is arithmetic, not a disclosed valuation. We report it as a calculation from one investor's markdown.

Daily active user claims. Musk said in May 2024 that X had "300 million daily active users". That appeared in the same post where he claimed 600 million monthly users. Neither figure appeared in a regulatory filing. The SpaceX prospectus disclosed monthly users but gave no daily count. So the 300 million has no audited backing.

Any specific percentage of bot or spam accounts. Twitter used to estimate this. It said fewer than 5% of mDAU were spam. Musk disputed that figure before buying the company. He said it was much higher. X has published no estimate since going private. Any current percentage is guesswork.

Revenue projections beyond 2025. eMarketer estimated $1.8 billion for 2025. We could not access its 2026 or 2027 projections. Other outlets cite them. We do not report a number we cannot read in the source.

User growth claims. Some reports say X grew users under Musk. Others say it shrank. We can only compare what Twitter reported in Q2 2022 to what the SpaceX filing said in 2026. Twitter reported 237.8 million daily users who could see ads. SpaceX reported 550 million monthly users across X and Grok. The metrics do not match. Monthly is always bigger than daily. And the 550 million includes a product that did not exist in 2022. So we cannot say whether the daily user base grew or shrank. The count changed shape.

What we could not verify

Three things we tried to check and could not.

The full text of Twitter's 2021 annual report. We accessed the press release announcing the results. We could not open the full 10-K filing at the SEC. The press release gave total revenue and advertising revenue. It did not break down costs or profit in detail. So the $5.08 billion revenue and $4.51 billion ad revenue are from the press release, not the full audited filing.

The exact wording of the SpaceX S-1. We accessed reports about the filing. We could not open the S-1 document itself on the SEC website. Search results confirmed the filing occurred on May 20, 2026. Multiple outlets quoted the same user figures. So the 550 million monthly users and 350 million posts per day are reported from coverage of the filing, not from reading the document directly.

eMarketer's paywalled forecast data. eMarketer's detailed charts sit behind a login. We accessed some estimates from their public blog posts. Those posts stated $2.98 billion for 2023 and referenced figures around $1.7 billion for 2024 and $1.8 billion for 2025. We could not view the full charts showing all years and percentage changes. So the estimates we cite come from eMarketer's own press statements and articles that quoted them, not from viewing the raw forecast data.

The honest line

Here is what cuts against the story this article tells. The user metric went up. 237.8 million daily in Q2 2022. 550 million monthly in March 2026. That looks like growth. But it is comparing two different things. Daily to monthly. A platform with no Grok to a platform with Grok. The method changed, so the comparison breaks.

If you take the monthly figure and assume the same daily-to-monthly ratio Twitter used to show, you could estimate daily users. We do not do that. It would be our arithmetic, not a disclosed number. And we do not know if the ratio held. People might log in less often now. Or more often. We have no data on frequency. So we cannot turn 550 million monthly into a daily equivalent that means anything.

The one comparison that holds is posting volume. Twitter said 500 million posts per day in March 2023. SpaceX said 350 million in the March 2026 filing. Same unit. Same company. Different years. That is a 30% drop. Fewer posts means either fewer people posting or less activity per person. Either way, it points down.

Revenue is unambiguous. Every source agrees it fell. The UK filing is required disclosure and it collapsed. The vendor estimates show the same direction globally. There is no reading of this where ad revenue held steady or grew.

How we did this

We searched for primary sources. Twitter's last earnings releases as a public company. The SpaceX S-1 filing. UK statutory filings at Companies House. X's own blog posts. And vendor estimates with disclosed methods.

Every figure above comes from one of those. Where we could not open a source, we said so. Where a number comes from vendor estimation rather than company disclosure, we named that. Where a claim circulates with no source, we listed it under unsourced claims.

Quotes are taken from press releases, blog posts, earnings announcements, and news coverage of regulatory filings. Dates are the publication or filing dates given by the source. We retrieved all sources between August 17 and August 18, 2026.

Limits: Most sources here are first-party statements. Twitter's earnings releases. X's blog. Musk's posts. A filing about a different company that disclosed X's numbers. None of these are independent audits of X under Musk's ownership. The SpaceX filing is the closest to an audited figure, but it is X's numbers included in a SpaceX document, not an audit of X itself. The UK filings are statutory, which makes them more reliable than posts. The eMarketer estimates are models, not measurements. They are disclosed as such, and we report them that way.

Sources

1. Twitter Announces Second Quarter 2022 Results, 22 July 2022. PR Newswire. Twitter's last quarterly earnings release as a public company. Reports 237.8 million mDAU, $1.18 billion revenue, $1.08 billion advertising revenue for Q2 2022. Retrieved 18 August 2026.

1. Twitter Announces Fourth Quarter and Fiscal Year 2021 Results, 10 February 2022. PR Newswire. Reports $5.08 billion total revenue and approximately $4.51 billion advertising revenue for full year 2021. Retrieved 18 August 2026.

1. X Platform Statistics 2026: SpaceX Filing Audited, Digital Applied, covering SpaceX S-1 filed 20 May 2026. Reports 550 million monthly active users (X and Grok combined), 117 million Grok MAU, 350 million posts per day, 6.3 million paid subscribers as of March 2026. Retrieved 18 August 2026.

1. X has 550 million active users, Grok's spicy mode may cause reputational harm: SpaceX IPO filing, Forbes, 21 May 2026. Coverage of SpaceX S-1 filing. Retrieved 18 August 2026.

1. Elon Musk, post on X, 26 May 2024. Stated X had 600 million monthly active users. Cited in Elon Musk Says X Now Has 600M Monthly Active Users, Social Media Today. Retrieved 18 August 2026.

1. New filings exposing Elon Musk's financials for X in the U.K. show revenue plummeted 58% in 2024, Yahoo Finance / Fortune, 27 January 2026. Reports X UK revenue of $39.8 million for 2024, down from $95.2 million in 2023 and $282.9 million in 2022, based on Companies House filings. Retrieved 18 August 2026.

1. X's UK revenues drop nearly 60% in a year as content concerns spook advertisers, Marketing Week, 9 January 2026. Reports Companies House filing showing UK revenue decline and attributes it to brand safety concerns. Retrieved 18 August 2026.

1. Twitter's ad business will bring in $2 billion less in 2023 than previously projected, eMarketer / Insider Intelligence, April 2023. States revised estimate of $2.98 billion for 2023, down from $4.74 billion projected before Musk's takeover. Retrieved 18 August 2026.

1. Multiple sources on eMarketer estimates for 2024-2025: Web search results indicating approximately $1.7 billion for 2024 and $1.8 billion for 2025. eMarketer's detailed charts are paywalled; figures cited from public summaries and news coverage. Retrieved 18 August 2026.

1. A new era of transparency for Twitter, X Corp blog, 31 March 2023. States "roughly 500 million Tweets posted daily". Retrieved 18 August 2026.

1. Fidelity has cut its estimate of X's value by 79% since Musk's purchase, TechCrunch, 29 September 2024. Reports Fidelity markdown implying X valuation of approximately $9.4 billion. Retrieved 18 August 2026.

1. X value down 80% since Elon Musk's Twitter takeover, USA Today, 2 October 2024. Reports Fidelity's September 2024 markdown and subsequent October 32% markup. Retrieved 18 August 2026.

1. Acquisition of Twitter by Elon Musk, multiple sources confirming $44 billion purchase price and October 27, 2022 closing date. Retrieved 18 August 2026.

Changelog

• 2026-08-18: First version drafted.