This morning when i opened my Facebook, to my surprise, i found that Alexa Rank for Facebook is at #2. Wow! And it overtakes Yahoo! Yahoo now is ranked no 2. Rank #1 of course is Google, but i think Facebook will overtakes Google soon. While for Twitter, it's still far way to compete, Twitter is ranked no 13 now, but i believe that Twitter will overtakes Yahoo soon.
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Facebook is the world’s largest social network, with over 300 million users.

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