The person on Facebook who will "like" virtually any possible interest or page that Facebook presents them regardless of whether they have a genuine interest in it.
OMG, my friendDylan is such a like-slut, he's always giving the thumbs up to every possible thing there is to like on Facebook.
When an individual 'Likes' everything applicable on another person's facebook profile in order to give them an obscene amount of notifications the next time they log on.
A Like Spike:
"_______ is now friends with ________"
(You Like This)
"_______ just farmed on farmville"
(You Like This)
"_______ commented on _______'s status"
(You Like This)