Twitter hashtags still work on X: a # before a keyword groups your post with others on that topic and helps it show up in X search. X recommends no more than 2 hashtags per post as best practice, although you can use as many as you like, and a hashtag stops working if you put a space or punctuation inside it.
That 2-hashtag line comes from X's own help page, and it surprises people who still stuff ten tags into every post. Below is how hashtags behave on X now, the formatting mistakes that break them, the point where hashtag use becomes a rule break, and how to dig up old posts on any tag.
How hashtags work on X
X's help page boils it down to a handful of rules:
- You put the # symbol before a relevant keyword or phrase to categorise the post and help it show more easily in X search.
- Clicking or tapping a hashtagged word shows you other posts that include the same hashtag.
- A hashtag can go anywhere in a post: the start, the middle or the end.
- Hashtags that become very popular are often trending topics.
- On a public account, anyone who searches that hashtag may find your post.
That last point cuts both ways. If your account is protected, your hashtagged posts won't reach strangers through the tag, because only approved followers can see them. If you want reach, the account has to be public; my guide to making a Twitter account private explains what changes when you switch.
How many hashtags should you use on Twitter?
| Question | X's answer |
|---|---|
| Recommended number per post | No more than 2, as best practice |
| Maximum allowed | No fixed limit: you may use as many as you like |
| Where to put them | Anywhere in the post |
| When it becomes spam | Excessive, unrelated hashtags in one post or across posts |
My take: stick to X's number. One or two tags that describe the post sit naturally in the text, while a block of tags at the end looks like an ad and eats characters you could use for the point you're making. Free accounts work within a 280-character limit, which my page on the Twitter character limit covers, so every tag has a cost.
Formatting mistakes that break a hashtag
X is blunt about this: you can't add spaces or punctuation in a hashtag, or it won't work. In practice that means:
| Written as | What happens |
|---|---|
| #SmallBusiness | Works: one unbroken word |
| #Small Business | Breaks: X says spaces stop a hashtag working |
| #small-business | Breaks: the hyphen is punctuation |
| #SmallBusinessTips | Works: no spaces, no punctuation |
I like capitalising each word, as in the last row, simply because a long tag is much easier for a person to read that way. The rule X cares about is the same either way: no spaces, no punctuation.
When hashtag use breaks X's rules
X's platform manipulation and spam policy lists hashtag behaviour it doesn't allow. These are the lines to stay well behind:
- Using trending or popular hashtags with the intent to subvert or manipulate a conversation, or to drive traffic or attention to accounts, websites, products, services or initiatives.
- Posting with excessive, unrelated hashtags in a single post or across multiple posts.
- Running multiple accounts to boost trending topics or hashtags.
- Running multiple accounts that cross-post similar or duplicate content to the same trending topics or hashtags.
The first one is the trap for businesses. Dropping a trending tag onto a post that has nothing to do with it, purely to get seen, is exactly what X describes. If your brand has a real link to the trend, join in; if it doesn't, leave it alone. X does allow up to ten accounts for different, non-duplicative purposes, but using them to push the same hashtag is what the policy targets.
How to find hashtags and old posts that used them
Typing a hashtag into the search bar shows you posts and accounts using it. For anything older or more specific, use advanced search, which X says works when you're logged in to X.com:
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- Enter your search in the search bar on X.com.
- Click Advanced search under Search filters on the upper right of the results page, or click More options then Advanced search.
- Put your tag in the hashtag field, and add a language, an account, a place or a date range if you want.
- Click Search.
X's own example: search #WorldCup sent from Brazil in July 2014 to see that year's World Cup posts. The same trick works for checking how a campaign hashtag performed after an event. I've written more on searching X by date if you want the date filters in detail.
Picking hashtags that help
- Use the words your audience would type into X search, not clever phrases nobody looks for.
- Check the tag first: search it and see whether the posts under it match yours.
- Use a branded tag for an event or campaign so people can find every post in one place.
- Keep it to one or two, as X recommends, and let the post itself do the work.
- Put the tag where it reads naturally. X says a hashtag works anywhere in a post, so a keyword in the middle of your sentence can carry the # itself and save you characters.
- Look at the results again a week later. If the posts under your tag are mostly spam or off-topic, swap it for a more specific one.
If you're hunting for tags with momentum, my guide on finding trending hashtags for free shows where to look.
My verdict
Hashtags on X are a search label, not a growth hack. Use one or two that describe the post, write them as one unbroken word, and never pin a trending tag to something unrelated, because that's the behaviour X's spam policy names. Do that and they quietly help the right people find you.
Frequently asked questions
How many hashtags should I use on Twitter?
X recommends no more than 2 hashtags per post as best practice. There's no fixed limit, but excessive, unrelated hashtags can break X's spam rules.
Why isn't my Twitter hashtag working?
X says you can't add spaces or punctuation inside a hashtag, or it won't work. Write it as one unbroken word, for example #SmallBusinessTips.
Can anyone see my hashtagged posts on X?
If your account is public, anyone who searches the hashtag may find your post. Protected posts are only visible to followers you've approved.
How do I search old posts by hashtag on X?
Use advanced search on X.com: add the hashtag, then filter by language, account, place or date range, and click Search.
