Keywords beat hashtags: write captions that get found.

For a decade, “add hashtags” was the whole playbook for getting discovered. That era is over — and you don’t have to take a marketing blog’s word for it. Platform by platform, the companies’ own documentation now says the same thing: the words in your caption are what gets read, matched, and ranked. Hashtags have been demoted to filing labels.

Here are the receipts.

What each platform actually says

Instagram is the bluntest. Its official explainer on Search says the text people type is “by far the most important signal,” matched against usernames, bios, captions, hashtags, and places — and its explicit instruction to creators is:

“For a post to be found in Search, put keywords and hashtags in the caption, not the comments.”

TikTok ranks search by relevance — “determined based on things like video captions, video text, and hashtags” — and says search “values relevance over video views and engagement.” It even pays for it: “search value” is one of the four dimensions of TikTok’s Creator Rewards Program, defined by how well content aligns with in-demand search topics.

YouTube settled the keywords-vs-tags question years ago: tags “play a minimal role in your video’s discovery,” while “your video’s title, thumbnail, and description are more important pieces of metadata.” Its search doc says relevance is estimated by how well title, description, and content match the query. Meanwhile hashtags get hard limits: three shown, and past sixty, all of them are ignored.

Pinterest — a literal search engine — tells businesses that pins with “keyword rich metadata get more distribution” and to put keywords in pin titles, descriptions, board titles, and board descriptions. Its current distribution guidance doesn’t mention hashtags at all; they’ve been quietly dropped from official advice.

Threads allows exactly one topic tag per post — its stated purpose is to help people who care about that topic find your post. One. The rest of the work is done by your words.

X recommends keeping hashtags to about two per post. And since X open-sourced its recommendation code, you can see what actually categorizes content: machine-learned embeddings and community detection reading your text — there’s no hashtag-counting ranking lever in there.

Every official number points the same way

Notice the pattern in the only concrete numbers the platforms publish about hashtags:

While the hashtag numbers shrink, the keyword guidance expands: Instagram says put keywords in the caption and the bio. TikTok says put them in the description, on-screen text, subtitles, and voiceover. Pinterest says titles, descriptions, and boards. The platforms are telling you, in their own docs, where discovery actually lives.

How to write a caption that gets found

A findable caption isn’t “SEO-speak.” It’s one habit: describe the post plainly, in the words a real person would type. Three parts:

Lead with what it is. The first line should name the thing — “3 renter-friendly kitchen upgrades under $50” — because that line is doing search duty on every platform at once (and on Google, which indexes public social posts too).

Use the words people search, not the words that sound clever. “Small apartment plant ideas” gets typed thousands of times a day. “Green babies living their best life” gets typed never. You can keep the personality — put it after the searchable line, not instead of it.

Then file it with a few precise hashtags. They still help in-app categorization everywhere except Pinterest — just within the platforms’ own numbers: a handful, specific, in the caption.

What to actually do

Bottom line

Every feed is a search engine now, and your caption is the listing. The platforms have all converged on the same instruction — describe your content clearly, in real words, where their systems read them. Hashtags still have a job, but it’s a small one. The keywords do the heavy lifting.