People use Facebook for different things. If someone posts a reference to something obscure that only certain people will catch, I do get a bit of a rush when I realize that I caught the reference. Yay me. Once in a while I'll comment, depending on who posted it, but I never repost them, because that's lame.
Now that I think of it, any of those "blah blah blah profound but obvious statement blah blah blah repost if you agree" are lame. I've blocked people from my Newsfeed for posting that shit all the time. Why don't I unfriend them? I don't know. Sometimes they're hot girls and tend to post pictures. Sometimes I've known them since school and would feel bad unfriending them. Sometimes they're both. I used to be more ruthless about it, but now I just block them. I never see their lame posts, problem solved.