I really don't understand Tumblr. I've signed up, somewhat set up my blog, and followed a bunch of blogs that I like. Unfortunately I don't know anyone who uses the site and I'm much too awkward to randomly follow/start talking to people. I think I'll just continue to follow things so my dashboard is filled with things that make me happy or something.
I've got one and I barely get on it as well. Seems the only fun you can have is if you're a part of a fandom or something.