Facebook Bingo: A term used for photos that have been posted on Facebook in which there are 5 or more people, all of whom have a Facebook profile, and have accurately been tagged in the photo.
At a bar with a group of friends- Hey let's get someone to take our picture! OMG! This is gonna be an awesome Facebook bingo. More beer, please.
Note: I am not in this picture. I found it in the profile pictures of one of my FB friends.