Take the example of Facebook. It was launched in two thousand four as a social network just for Harvard students.
VOA: special.2009.09.14
Now anyone can join. Facebook said it had over two hundred fifty million active users as of July.
VOA: special.2009.09.14
Facebook started as a site for college students to share interests and information.
VOA: special.2010.05.28
as in a friend you accepted on Facebook?
VOA: special.2009.09.14
The question has to be 'How do we maximize the value of the traffic that we're going to receive?'" For a lot of advertisers, internet advertising, social networking sites such as Twitter or Facebook, and internet searches on sites such as YouTube can be the answer.
VOA: standard.2010.01.27
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