Etymology

like4like

Today it means: On social media services, the practice of liking a person's post or page in exchange for said person mutually liking one's post or page back, sometimes with the goal of artificially inflating one's like count. Full definition →

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The story

Abbreviation of like for like, itself a clipping of like for a like back or a similar phrasing; otherwise analysable as like (“to show approval of something posted on the Internet by marking it with a vote”) + 4 (“abbreviation of for”) + like.

Etymology from Wiktionary, CC BY-SA 4.0.