Definition: A hashtag is a word or phrase written after the # symbol, with no spaces, that turns into a clickable link grouping public posts on the same topic.
Also called: hash tag, tag
Updated October 11, 2026
Hashtags started as a way to follow conversations on Twitter. Today recommendation feeds decide most distribution, so a hashtag is mainly a topic label: it helps the platform understand what a post is about and makes it findable when someone taps or searches the tag. Using many loosely related tags no longer buys extra reach.
In December 2025 Instagram said it would gradually limit captions on posts and Reels to five hashtags, reported by Social Media Today with Instagram’s statement. On X, hashtags count toward the 280-character post limit, so each one costs space. Check each app before reusing an old caption with a long block of tags.
Pick a few tags that describe the post exactly and that the right people actually follow or search.
A Leeds florist’s Instagram post about a wedding arch uses three hashtags: #LeedsWedding, #WeddingFlowers and its campaign tag #BloomAndCoWeddings, inside Instagram’s five-hashtag limit.
A character limit is the maximum number of characters a platform accepts in a post, caption or field, including spaces, emojis and links.
Organic reach is the number of unique people who saw a post or account through unpaid distribution (feeds, search, shares and recommendations), excluding anyone reached through ads.
A social media algorithm is the set of ranking systems a network uses to decide which posts each person sees, and in what order, based on predictions of what that person is likely to engage with.
User-generated content (UGC) is any content about a brand made by people outside it, such as customers’ photos, videos, reviews and posts, rather than by the brand itself.
Write once, tailor each version yourself or with optional AI, and schedule to 6 networks from one calendar.