I really dislike when people make judgments about the typical Tumblr user. I was on Tumblr for at least two years, and given my stream (over 300 people) consisted entirely of people I chose to follow, I regularly had conversations with people who were mature, intelligent, nonjudgmental, into all sorts of really cool stuff, helpful, logical, level-headed, and so forth. If anybody is complaining about teenage girls being on Tumblr, why are you following them? (am using the general 'you', not talking about you specifically, OP.) That's the entire point of tumblr, you can choose who to follow and who not, and what is it to you if someone is saying stuff you don't agree with. Just don't follow them. It's not like here on Hubski, where as much as I try, I can't seem to get away from the people I don't want to hear from, they're a toxic cloud.