Just imagine you sell or buy with just a click on facebook using bitcoins, This is an opportunity bitcoin should grab, and facebook should not miss!

Facebook is testing a way for advertisers to make the direct sales pitch to people, and it could be a game-changer for advertisers and retailers. Through the Buy button, users can complete a transaction while staying in Facebook.

http://www.insidefacebook.com/2014/07/23/the-buy-button-facebooks-next-big-thing/