the act of aimlessly exploring and in general wasting valuable time on facebook in lieu of being productive in such activities as homework, napping, etc.; usually applicable to college students
John knew that he had a sociology midterm and englishpaper due the next day, but ended up facebookrastinating most of the night instead.
The act of facebooking while simultaneously attempting to compose an essay on microsoft word or other such program.
Time allotment tends to be 99% facebook, .5% going to the bathroom when you don't have to, .4% staring blankly at your essay, and .1% making up excuses for not having your essay.
Friend on facebook: Hey d00d what is up? I haven't talked to you in 4 ever! Lawl I just totally got a new pencil sharpener, want to hear about it?
Facebookrastinator: YES
Friend on facebook: You're not just facebookrastinating, are you?
Facebookrastinator: YES. i have to go to the bathroom brb.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.