This is the internet, if you put a child or teenager in a chat-room you are basically dropping them in a room full of lonely 40 year old pedophiles.
Honestly, your teenager is safer chatting on a porn site than anything actually designed for kids. If the chat-room says "Kids" or "Teens" it's basically advertising pedophiles and perverts to come to the buffet.
Don't you watch Dateline? Chris Hanson catches these guys in the hundreds all day. He's made a career out of it.