Well, the terms of use state that you have to be at least 13 to even use the site. Of course, who even reads the terms and conditions? Probably quite a few users are younger than that.
Another thing I don't particularly like is when someone uses a joke that we have all already heard, and posts it onto a different template. It's not exactly a REPOST, but it's not fresh and exciting anymore. That's my personal opinion of course - sometimes the template can make all the difference.