When you frequently stalk someone on Facebook (or other social media devices) and use their pictures for sexual entertainment
Person 1: Damn dude, did you see the bikini picture on Aubrey's Facebook page?
Person 2: Not yet, is it hot?
Person 1: Yeah man, I was Facebook Fapping to it all last night.
The act of masturbating to pictures of people that are posted on Facebook. This includes profile pictures, tags, videos and everything of that nature.
Jeff - "Yo, what'd you get up to last night?"
Scott - "Facebook fapped to Shauna...."
Jeff - "Dude, that's just plain wrong."
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