Well, in my opinion, no. There can be sexoffenders and stalkers asking your name, address and lots of other things. I don't even trust people enough to have a face book!
teens use chat rooms for many reasons, sometimes if they want to connect to their friends around the world or if they are bored then they could talk to random people on the specific chat room and fun...
There are plenty of good free chat rooms on the net. Just try using Google and you should find plenty. I would recommend www.chat-buddy as my favourite free chat room. You could also try ukchatterbox...