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4.
To pass the buck on moral or social responsibility and/or action for an issue/cause by re-posting the link about the issue/cause to your own Facebook profile, instead of taking the action requested by the post.
"Ugh, I don't really have time to sign this 'feed the polar bears' petition. I'm gonna Facebuck this one to my friends."
by MissGodiva February 04, 2013
 
1.
v. To unfriend (or block) someone on Facebook (or any similar social networking service)
"Dude, I can't believe that girl. I sent her an invite to my bondage workshop and she Facebucked me!"

"If you tag one more photo of me, I will Facebuck your ass!"

"Sweety, I know I slept with your brother and your best friend at the same time, but do I really deserve a Facebucking?"
by Montana Jack November 18, 2009
 
2.
to be drunk, inebriated, intoxicated, or shammered while facebooking.

often results in ridiculous and/or shameful posts one would not make whilst sober.

can be a verb as well.
" i was soo facebuck last night.. i dont know why i wrote one insert ex's name here's wall.

"holy shiet daria, your are all over my news feed" "ya i facebucked last night'
by Ninja Shit January 26, 2011
 
3.
Virtual money that is used in the on-line community, facebook.com
I won 2,000 facebucks last night playing Texas Hold 'Em.
by daybedoe July 17, 2008