To cut down on some of the trouble Maybe you should make only friends be able to reply 2 other friends topics. All people should be able to read them but only friends reply to friends topics.
I will use a prime example:
I posted a post and Hydra posted a comment there I am NOT friends with Hydra so( high dress )hydro should not be able to post a comment. In the same with me If he post a topic I should not be able to reply to that topic Because I am NOT friends with him Or her or it or whatever.
That's just another way to cut down on trouble.
One of the hardest lessons to learn Are the ones that hurt the most..