Crossword Genius

Many a viral tweet (4)

Ross

I believe the answer is:

meme

(Other definitions for meme that I've seen before include "Concept that spreads rapidly on the Internet" , "Transmitted cultural idea" , "Question that spreads on the internet" , "Cultural belief that assumes a life of its own" , "Image etc. that spreads rapidly on the Internet" .)

I've seen this clue in The New York Times.
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