But, that's the problem. Some of them do come over her and post. That in itself is not a problem, but sometimes they will give wacky suggestions or comments and you go, "Huh???"

Then after a couple minutes you realized, "Oh that poster is a kid. That's why they thought that."
In real life, we would see the person we are talking to and we'd know they are a kid or teen and naturally would cut them some slack. But, unless they have pictures of Edward, from Twilight, in their signature, you generally don't know they are a kid.
I wish the kids and teens had to have an icon next to their screenname which clearly indicates "Child/Teen member," until they turn 18.