Has a usage as a verb, "to facebook" can be the following:
a.) to post a wall comment
b.) to add as a friend on facebook
c.) To go to someone's profile, look at all their pictures and notice how fucking hot they are, but don't add them. Instead, continue to visit their site and see what they do and if they're still single or not.
d.) message someone on facebook
e.) To veg out bored to death on facebook.
I checked my facebook today.
I looked her up on facebook.
Go on FB I wrote on your wall.
a.) I facebooked you with the time of the concert.
b.) I facebooked that cute girl from class, hopefully she accepts it.
c.) I facebook that hot girl and stalk her like crazy
d.) I facebooked the math answers to you, check your inbox.
e.) I was facebooking all day and not doing my homework.
Girl: Last night I didn't get any work done because I was looking at facebook all night!
Girl 1: I found that really hot guy from our history class on facebook last night!
Girl 2: Really?!
Girl 1: Yeah! His name is insert name here, he's in insert classes here, he's single and is looking for a relationship, friendship, dating, random play, or anything he can get! (options under relationship status and what one is looking for)
Facebooker 2: wow. I really didn't need to know all that.