Social network apps for iPhone that teens use?

I'm 15, one of the teenagers, who loves keeping in touch with others via social networks. What I want to know… Today, what are some social apps that teenagers use?

Mostly Facebook, or Twitter. Although, I prefer Facebook more than twitter because its easier to find and follow friends.

Well if you're a teenager, you should already know. FB, Twitter, pof, and so on…
Honestly in my opinion you sound like a creepy old guy.

I'm getting the impression that you are not what you say you are. Any 15 year old with internet access already knows about FB, Twitter, etc.

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