Teen chatting apps for iPhone4?

What are some good teen chatting apps for iPhone 4? I used to use what's good: local chat, but people hardly get on.
TAKE NOTE: I like chatting apps to meet new ppl, so don't give me BS About how chatting isn't good. Mind your businesses. ONLY POST IF YOU KNOW OF AN APP, please don't waste my time!

I know a really good one for android. Its called "the lobby" they have different rooms and there's alot of cool people there.

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