I joined a chat site like the one you describe Elsa, and trolls still made their way in there and pretty much destroyed the camraderie, trust, and privacy, because the moderator wanted to be inclusive, knowing that if she (I knew her personally, too) let these people in, they would cause some trouble that she could control. Well, she lost control, and I left her private site because people gossiped, told lies, posted private information to publicly humiliate people on the site they didn't like and it just became a gross situation. Made me realize that just because people are old enough to be adults, doesn't mean they'll act that way.