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"Liking" your own post on Facebook or retweeting your own tweet on Twitter
"I look so awesome today" - Liking this comment with a thumbs up beneath it on Facebook or retweeting comment on Twitter is Social Media Masturbation.
Abbreviated as SMM
The posting of images or statuses to satisfy oneself on social media and gain attention, as opposed to posting anything genuine or important.
She only posts social media masturbation updates, just to make her look better than she is.