I don't follow automactially. I follow people whose profile makes me smile or laugh. If the person drinks coffee and/or eats chocolate (see picture to the right) and that's in their profile--they don't even need to be a writer. :) I follow because I want to laugh, smile, and/or network.
I don't expect to automatically be followed back either, but I usually am because they're writer's like me.
I, usually, won't follow anyone who seems very young, like a teenager young. Unless they write. I had a follow request from a Justin Beiber fan. I told the young lady, I'm from the Huey Lewis and the News generation. I don't have Beiber Fever.