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: Hawaiian Airlines' inaugural flight to Beijing
Photos: "Blood Moon" Lunar Eclipse, Apr. 14
Photos: Hapalua Half Marathon, April 13
More Photo Galleries »