How Facebook, Twitter Court Political Campaigns

How Facebook, Twitter Court Political Campaigns
President Barack Obama gestures as he is introduced at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP Photo/Morry Gash)
President Barack Obama gestures as he is introduced at a campaign event Saturday, Nov. 3, 2012, in Milwaukee. (AP Photo/Morry Gash)

Social-media companies Facebook Inc. FB -0.14% and Twitter Inc. are trying to turn political advertising into a big business, courting presidential candidates, political-action committees and interest groups to siphon off some of the billions of dollars spent on election ads.

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