Hashtag

A word or phrase preceded by the # symbol that labels content, making it searchable or grouping it with related posts.

Metadata: Structured information that describes, organizes, or supports the retrieval of other information. A hashtag acts as descriptive metadata attached to a post.
Chris Messina: An American designer who proposed using the hash symbol to group conversations on Twitter. Messina suggested hashtags as a practical way to organize Twitter discussions.
Hashtag activism: The use of hashtags to publicize causes, coordinate participation, or frame political debate. Activists use shared labels to connect posts and circulate campaign messages.
@mention: A post notation that names or links to a user account, commonly using the @ symbol. An @mention addresses an account; a hashtag labels a topic or category.
Networked public: A public formed and shaped through networked communication technologies and their practices. Hashtags help otherwise separate users gather around visible shared topics.
Information retrieval: The process of finding relevant information in a collection of documents or data. Hashtag indexes let platforms retrieve posts by shared labels.
Twitter: A social networking service centered on short posts, now known as X. Hashtags gained widespread adoption through Twitter's early user community.
Trending topic: A subject receiving unusually high attention on a platform during a particular period. Platforms may use hashtag activity to identify emerging topics.
Keyword: A significant word or phrase used to represent or retrieve information. Keywords can aid retrieval without the hashtag's explicit symbol-based syntax.
Context collapse: The merging of distinct social audiences into a single communication context. A widely circulating hashtag can expose a post to unintended audiences.

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