What is the social's networking that you join?

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Hye everyone!! I had join many of social networking, I have join facebook, myspace, bebo, hi5, twitter and have many of social network, For me, the best social network is Facebook, Facebook is great site, Facebook easy to use and also can make marketing with facebook, I had many friends and support me on Facebook, What about you all, what is the social network you join.. and what the best social network you join??