The rush of having someone comment on your status update. The rush of the feeling of pleasure that a lonley person gets when they get attention on the ineternet. Most of the time it's people who possess 200 or more friends but still rarely get comments and likes on their status updates and ends up feeling depressed and down as a result.
It's just a facebook rush, buddy. It's not real life. Nobody cares about you have to say so shut you're gay ass up and fuck friends.