Although I don't spend a lot of time browsing other people's posts anymore, I do update my own every now and then. I especially enjoy updating my Tumblr that's dedicated to Guild Wars 2, an MMO game. Sometimes I'll take screenshots of my characters and random landscapes that inspire me, and then edit them in Photoshop.
I also have another, more general Tumblr that I use to post pictures (among other random things) that inspire me to write about certain locations and scenarios.
I just use my tumblr as my personal fan page of various things I like. I make no apologies.