When your face gets picked out the crowd in a photograph when you were'nt paying attention and gets highlighted on facebook.
These photos tend to be less than attractive and usually lead to some embarrasment. ie. if you were just about to sneeze
Stealing your friend's phone or laptop and posting somethingembarrassing on their Facebook page, making it seem like it came from them.
"I just picked up Danny's phone , opened his Facebook and wrote this: "what I'm most thankful for is Barbra Streisand." Epic Facebomb. The comments will be hilarious.