alika - 4:20 pm on Apr 27, 2013 (gmt 0)
One client of mine has successfully cultivated Facebook as a significant traffic source. They get more traffic some weeks from Facebook than Google. They've got 575,000 likes on their FB page, and they're really heavy on infographics (which they cross post on Tumblr and Pinterest). They sometimes get 150K-200K visits from FB in a month.