5 Ways to Encourage Customers to Share Your Content

"Giving people something unique or exclusive in return for sharing can be a powerful motivator — we all want to feel privy to something special.

For example, in a recent campaign to build awareness for recording artist Cady Groves, RCA offered fans a free song download for registering on the Cady Groves website. RCA also incentivized fans to share Cady’s music with their friends by offering a free merchandise pack to every fan who convinces five people to download the song."

http://mashable.com/2011/07/12/encourage-social-sharing/