Instagram and TikTok became search engines — and Google admits it

You post a reel about where to eat in Brooklyn. You write a caption. You pick a sound. A week later someone searches "best pizza Brooklyn" on TikTok. Your reel does not show up. You never wrote those words anywhere they could be read.

So you go looking for what went wrong. Nothing broke. You were not shadowbanned. You posted to a search engine. You forgot to make the post searchable. No one taught you that the rule changed.

A Google executive said it out loud in 2022. Young people search on TikTok and Instagram now. Not just browse. Search. Type words into a box and expect an answer. Both platforms saw it coming. Instagram added keyword search in 2021, on an app that now reaches three billion people a month. TikTok built a whole search ads business by 2024. And the posts that show up are not the ones with the most views. They are the ones with the right words in the right places.

What follows is a reading of what the platforms publish and what Google said. It covers Instagram and TikTok. It stops where those pages stop. Every source below is linked, dated and quoted.

A Google exec said 40% out loud, then qualified it

Start with the number everyone quotes. Prabhakar Raghavan runs Google's Knowledge and Information organization. That includes Search and Maps. He spoke at Fortune's Brainstorm Tech conference on 12 July 2022. He said this:

In our studies, something like almost 40% of young people, when they're looking for a place for lunch, they don't go to Google Maps or Search. They go to TikTok or Instagram. — Prabhakar Raghavan, Fortune Brainstorm Tech, 12 July 2022

That is from the TechCrunch report published the same day. The reporter asked Google about it. Google confirmed the number came from an internal survey. The survey covered U.S. users aged 18 to 24. Google had not published the data at the time.

The 40% is real. It also counts one thing. Searching for a place to eat. Not all searches. Not product searches or how-to searches or news. Just places. Raghavan named lunch. The number gets quoted as if it covers everything. It does not. It is narrower than that. And it is still a lot.

Raghavan said one more thing. "New internet users don't have the expectations and the mindset that we have become accustomed to." Young users do not type keywords the way Google expects. They look to discover content in what he called "more immersive ways". That was his explanation for why the behavior moved.

So Google saw it. Google measured it. And Google said so in public. That was four years ago. Since then both platforms built for it.

Instagram added keyword search in 2021 and explained what it reads

Instagram announced keyword search on 25 August 2021. Adam Mosseri wrote the post. He runs Instagram. Before that, search worked on hashtags, usernames and places. Nothing else. Keyword search changed that. You could type "home decor" and see posts. Not just #homedecor. Posts with those words in the caption.

The same post said what search looks at. It tries to match what you type with four things. Usernames. Bios. Captions. Hashtags. And places. Those five. The post also said where keywords do not work. Comments. If you write the words in a comment on your own post, search does not see them.

Mosseri's post named three signals that decide what shows up first. Your text in search. What you type. Then your activity. Accounts you follow, posts you have seen, how you interact. Then popularity signals. Clicks, likes, shares, follows. In that order.

Meta published a more detailed page later. It is an AI system card. Meta puts one out for each part of Instagram that uses ranking. The Search system card was stamped 22 June 2026. It describes four steps. Gather inventory. Score results. Apply filters. Rank by score.

The card names what can show up in search. Hashtags, places, reels, posts, profiles, audio. Then it names three kinds of prediction the system makes. One for accounts. One for suggested keywords. One for hashtags. Each has its own list of signals.

For accounts, the system guesses how likely you are to click. It reads the age similarity between you and the account owner. How well your search words match the username or profile name. How often people in your country click that account after searching. How often you visit that profile. And the social graph. Who you both follow.

For hashtags, it reads click-to-view ratio in your country. Total click volume. How similar the hashtag is to what you typed. And what device you use.

The system card says nothing about captions being searchable. Mosseri's 2021 post said they are. The card does not contradict that. It just does not repeat it. Both are first-party sources. Instagram's own writing. We report both and do not pick one.

What matters is this. The words you type go somewhere. The system matches them to something. And if the match is in your username, your bio, or your caption, it can be found. If it is only in a comment, it cannot.

TikTok does not publish what it indexes, but its ad system gives it away

TikTok does not publish a system card. It does not publish a list of what search reads. So we looked at what it tells advertisers instead. That gave us more than expected.

TikTok launched Search Ads Campaign on 24 September 2024. That is a paid product. Brands can bid on keywords. Their ads show up in search results. Before anyone would pay for that, search had to work. And it had to be used.

TechCrunch's report on launch day carried TikTok's own numbers. 57% of users use TikTok's search function. And 23% search within 30 seconds of opening the app. TikTok called itself "a destination for discovery and a place where users come to search".

Search Ads Campaign would not exist unless search worked and people used it. The product proves the behavior. And the help pages for the product describe what TikTok reads.

There are two products. Search Ads Campaign is the newer one. Automatic Search Placement is older. Both let advertisers show up in search. The second one does it automatically. No keyword bidding. TikTok picks the keywords by reading the ad content.

The help page for Automatic Search Placement says what the system reads. This is the sentence that matters:

The automatic system will look at the App name, custom identity, video content (including text and non-text elements), URL (content from the web landing page), and video title as its main source of learning to understand which keywords are relevant. — TikTok Ads Help, Automatic Search Placement FAQs

That sentence describes an ad. But the system that matches ads to searches is the same system that matches organic posts to searches. And it names "video content (including text and non-text elements)". Text elements are captions and on-screen text. Non-text elements are everything else. Audio. Objects. Motion.

TikTok also publishes an auto captions feature. It transcribes speech into text. The feature launched in April 2021. The newsroom post says captions are "automatically transcribed and displayed" on videos. Creators can turn it on. Viewers can turn it off.

What TikTok does not say is whether search reads the transcribed speech. The help page for ads says the system reads "video content" including non-text elements. Spoken words are non-text elements. Whether they are indexed is not stated anywhere we could find. But the behavior exists. The platform transcribes speech. And the ad matching system reads video content beyond text. The gap between those two is small.

What this means: if you say "best pizza Brooklyn" out loud in your video, TikTok may read it. If you write it on screen, TikTok definitely reads it. If you write it in the caption, TikTok reads it. If you only think it, TikTok does not.

The shift is from chasing virality to being findable

The platforms changed the rule. The old rule was: make something people want to share. Get it in front of as many people as possible in the first few hours. Hope it spreads. That rule still works. But it is not the only rule anymore.

The new rule is: write the thing people will search for. In the places search can see it. Caption, bio, on-screen text, spoken words. Then let search bring them to you. Not in the first hour. Over weeks. Months. However long people keep searching.

Virality is a spike. Search is a long tail. One post can do both. But they are scored differently. A viral post wins on engagement. A searchable post wins on relevance to a query. Instagram's system card says so. The ranking for search uses "the type of content and how well it matches your query intent". Not how many people liked it. How well it matches what you typed.

This changes what to write. A viral caption is short. It has a hook. It makes you feel something fast. A searchable caption names the thing. "Black bean tacos recipe." "How to fix a leaking faucet." "Thrift stores in Austin." The words someone would type.

It also changes where the views come from. A viral post gets shown to people who did not ask for it. They are scrolling. The algorithm put it in front of them. A searchable post gets shown to people who asked. They typed words. Your post matched. That person is warmer. They wanted an answer. You gave it.

Neither is better. They do different jobs. But only one of them was taught. Everyone knows about the first three seconds of a reel. About trending sounds. About posting at the right time. Almost no one was taught that Instagram indexes captions or that TikTok reads on-screen text. So a lot of posts are invisible to search. On platforms that are now search engines.

What Instagram and TikTok do not publish

Three things, named so no one assumes we checked them and stayed quiet.

What Instagram search reads beyond the five things Mosseri named. The 2021 post said usernames, bios, captions, hashtags, places. The 2026 system card does not list them. It describes ranking signals instead. We do not know if Instagram added more searchable fields or narrowed them. We report what both sources say and do not fill the gap.

What TikTok's organic search reads. The ad system reads video content, text and non-text elements. We assume organic search uses the same system. TikTok does not confirm that anywhere. And it does not list which fields are indexed. Captions, hashtags, sounds, spoken transcripts. Any or all of those could be in or out. Nothing we read settles it.

Whether either platform ranks search results by engagement. Instagram's card says "click-through and action rates" are signals for account results. That is engagement after the search, not before it. TikTok says nothing. And neither platform publishes ranking weights. So every claim about what matters most in search is unproven. Ours included.

How to make a post searchable

Write the thing people search for. In the caption. In the first line if you can. Instagram reads captions. So does TikTok.

If you are on TikTok, say it out loud. The platform transcribes speech. And the ad system reads video content including non-text elements. Spoken words are non-text. Put the keyword in the first three seconds. Then put it on screen as text. That covers two of the three places.

Use the words people type. Not the words you would say to a friend. Someone searching for pizza in Brooklyn types "best pizza Brooklyn" or "pizza near me Brooklyn". They do not type "this place is amazing". Write the search term.

Do not put it in a comment. Instagram's help says comments are not indexed. Write it in the caption or it does not count.

Hashtags still work. But they are not the only thing anymore. Instagram removed most of the other places a hashtag used to reach people, and the full autopsy of what hashtags still do on Instagram walks through each removal. Search is most of what is left. A hashtag is one signal. A caption is another. On-screen text is a third. Do all three and you show up in more places.

The last part is harder to accept. You cannot see the results the way you see views. Search traffic comes in slowly. Someone searches today. Someone else searches next week. Your post shows up each time. You never get a notification. The views just arrive. Over time. And they do not spike. They accumulate.

That is the trade. Virality is fast and visible. Search is slow and invisible. But it lasts. A viral post dies in three days. A searchable post works for months. As long as people keep typing those words.

Where this lands

Instagram and TikTok are search engines now. Not by accident. By design. Instagram added keyword search in 2021. TikTok built a search ads business by 2024. Google measured the shift and said so out loud. 40% of young people searching for places on social instead of Google. That number is four years old. It has not gotten smaller.

The rule changed. Being viral is not enough. Being findable matters too. And most people posting right now are not findable. They write captions for people who already follow them. Not for people searching. They chase the algorithm that shows posts to strangers. They ignore the algorithm that answers questions.

The fix is small. Write what people search for. In the caption. On screen. Out loud if you are on TikTok. The work is the same. The words are different. And the results come later. Not in the first hour. In the first month.

You posted a reel about pizza in Brooklyn. Someone searched for it. Your reel did not show up. Now you know why. You never wrote the words. You can fix that in the next one.

How we did this

Scope: this post reads what Instagram, TikTok and Google have published about search. No data collection. No testing. No interviews.

How we read them: all six sources below were opened and read directly on 18 August 2026. TikTok's help page for Automatic Search Placement is built by code in the browser, so it was read in a browser rather than fetched. Every quotation is verbatim from the page as it appeared.

What we could not open: TikTok Creator Portal pages and several trade press articles about Instagram's Reels keyword search expansion. Multiple URLs returned 404 errors or redirects to generic pages. The dates and claims about a Reels search expansion in October 2022 could not be verified from a primary source, so they are not in this article.

Limits: most of the claims above rest on a first-party statement. Instagram describing its own ranking. TikTok describing its own ad system. Neither publishes ranking weights. Neither has been independently audited.

Sources

1. Sarah Perez, Google exec suggests Instagram and TikTok are eating into Google's core products, Search and Maps, TechCrunch, 12 July 2022. Source of Prabhakar Raghavan's statement at Fortune Brainstorm Tech and confirmation that the 40% figure came from Google's internal survey of U.S. users aged 18-24. Retrieved 18 August 2026.

1. Adam Mosseri, Break down how Instagram Search works, About Instagram, 25 August 2021. Source of the keyword search announcement, what search reads (usernames, bios, captions, hashtags, places), the note that comments are not indexed, and the three ranking signals in order. Retrieved 18 August 2026.

1. Instagram Search AI system card, stamped UPDATED JUN 22, 2026. Meta Transparency Center. Source of the four-step process description and the three kinds of prediction (account clicks, suggested keyword clicks, hashtag clicks) with their signals. Retrieved 18 August 2026.

1. Sarah Perez, TikTok comes for Google's ad business as it starts letting advertisers target its search results page, TechCrunch, 24 September 2024. Source of the Search Ads Campaign launch date and TikTok's statistics: 57% of users utilize search, 23% search within 30 seconds of opening the app. Retrieved 18 August 2026.

1. FAQs for Automatic Search Placement, TikTok Ads Help, undated by the publisher. Source of the quoted sentence describing what the automatic system reads: "App name, custom identity, video content (including text and non-text elements), URL, and video title". Retrieved 18 August 2026.

1. Introducing Auto Captions, TikTok Newsroom, April 2021. Source of the auto captions feature description: automatically transcribes spoken content into text that creators can edit. Retrieved 18 August 2026.

Changelog

• 2026-08-18: First version drafted.