An Illinois senator who was virtually unknown in 2004 defeated Hillary Clinton in 2008 to win the Democratic U.S. presidential nomination.
And he used social media to do it.
His YouTube videos got 110 million views, estimated to be 14.5 million hours of viewing. Mass media advertising to reach that many viewers would have cost $47 million.
A famous rapper made a promotional video that gave him even more free publicity.
At the time of the election, he had five million fans on Facebook — over four million more than his opponent. On
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