Someone who is constantly on myspace
looking at the same people that they don't know over and over again to see if they have new pictures, who their friends are etc. etc.
Lurkers often lurk
in packs, to show their fellow lurkers their lurkees, and to show off their taste in lurkees.
Koala is such a lurker, every night she sits in front of her laptop on myspace, lurking people she suspects may be cooler or prettier than she is.