I just post about things I like. I like gifs lately. I tend to post about: friends, cosplay, and getting really excited about shows, movies, comics, books, games and whatever.
It's an unpredictable jumble of stuff I like. Maybe you like some of it too! Neat!
I do twitter too, if you want 140 characters of TMI and silliness more often, @Explosivemarble is the place to be. I still wish they'd let me have my s.