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."
Scott - "Facebook fapped to Shauna...."
Jeff - "Dude, that's just plain wrong."
by Pneisme September 29, 2010
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.
Person 2: Not yet, is it hot?
Person 1: Yeah man, I was Facebook Fapping to it all last night.
by Deathmuffin May 15, 2014