when you and your friends are out and about and all of a sudden somethingreally good happens and you get a picture of it and it imeditely needs to go on facebook
you and your friends are at a friends house drunk and you get a big group shot of everyone and someone from the back goes "facebook it" and everyone knows what you are talking about
People on FB that think they know everything and consult other FB people on religion, politics and other topics. In reality these people really don't know shit.
the digital equivalent to 'make it public' as in when two people start bringing out any kind of r'ship in front of people- facebook is the first place they'd do so. Probably precedes real life flirt, fight, friendship whatever
Dude (after dinner on first/blind date): wow we look cool in this pic. mind if i wall it on my facebook?
Chick: i dun think thats such a good idea. we should wait a while before we make it facebook.