A twitterer who constantly checks his/her twitter account hoping that the celebrity they stalk will respond to something they commented on that particular persons page.
Darryl - "Why do you look so tired?"
Leroy - "I was up all night waiting to see if Jon Stamos said thanks for telling him his ass would make a great helmet."
Darryl - "God your a twack! Well...did he?"
Leroy - "(weeping) no!"
Darryl - ".....Would mine??"
(long, awkward pause)