Consumers use Facebook to interact with friends, be entertained and express themselves through their public affiliation with brands—factors that combine to create a potent viral marketing platform,” said Jeff Rohrs, principal, ExactTarget’s research and education group. “By engaging consumers on Facebook in a way that keeps them entertained, brands have an unprecedented opportunity to mobilize Fans and get introduced to their friends.

Nearly 40% of Facebook users who become fans do so to give discounts, announce promotions, new product info updates and 39% become fans to show their support for a brand to their friends. Just as interesting is how these stats compare to Twitter and email marketing. Only 23% of respondents said they follow brands on Twitter and about 10% say they subscribe to email notifications for the same reasons.