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Liker is a noun in English used to denote a person who likes something. In general usage, a liker is someone who holds a preference or favorable opinion toward a person, idea, object, or activity. The term follows the standard English pattern of agent nouns formed with the suffix -er, indicating someone characterized by a particular action or state.

In modern digital media, the term has a more specific meaning. On social platforms, a liker is a user who has expressed approval by clicking the like button on a post, comment, or profile. Liker counts are a basic form of engagement metrics, and platforms may tailor feeds or recommendations based on the volume and identity of likers, though the exact mechanisms vary.

Other uses of the term are less specialized. Liker can appear as a surname in some regions or as a place name. In casual speech, liker can be used humorously to describe someone who seems inclined to agree or approve readily, sometimes with a sense of irony.

See also: like button; like (emotion); engagement; social media.