Crossword Genius

Twitter titter (3)

Ross

I believe the answer is:

lol

'twitter titter' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lol that I've seen before include "Very funny (1)" , "so funny online!" .)

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