Hashtag
A word or phrase preceded by # that categorizes content and makes it discoverable to users following or searching that topic.
A hashtag is a keyword or phrase preceded by the # symbol that links content to a searchable feed of all posts using the same tag. Hashtags were popularized by Twitter (now X) in 2007 and have since spread to Instagram, LinkedIn, TikTok, and Facebook.
Hashtags serve two purposes: discoverability (users searching or following a hashtag can find your content) and conversation participation (joining trending discussions). Their effectiveness varies by platform — Instagram hashtags drive significant discovery, while their impact on X has diminished as the platform relies more heavily on interest-based feed algorithms.
Best practice is to use 3-5 highly relevant hashtags rather than stuffing posts with many tags. Over-hashtagging looks spammy and can reduce engagement on some platforms.
Related Terms
Frequently Asked Questions
- Do hashtags still work on X?
- Hashtags have less impact on X than they used to. X's algorithm now surfaces content based on interest graphs rather than hashtag follows. One or two highly relevant hashtags can still help with discoverability, but the days of hashtag-driven growth on X are largely over.
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