Selling social media clicks becomes big business
1 of 1
A sign with Facebook's "Like" logo is posted at Facebook headquarters near the office for the company's User Operations Safety Team in Menlo Park, Calif. in this Dec. 13, 2011 file photo.
Photos: Island Images: July 2015
Photos: Page One Gallery: July, 2015
Photos: Firefighter Training, June 29
More Photo Galleries »