According to Net Applications Facebook accounted for two thirds of all referrals in November. Back at Facebook F8 we heard from Mixcloud who gets an incredible amount of traffic from Facebook. They found their bounce rated dropped 50% when they introduced social connection features!
As a member of the Google+ team I find it hard to see how Facebook can be this social when they actively block users from befriending strangers on the website. But this puts them in a unique position in that everyone’s friend on the social network is personally connected to them and a level of trust has already been established. This means shared content on Facebook is much more likely to be clicked. Mixcloud’s click-through rate increased by 300% when their links were used with face piles (a face pile is a collection of your friends pictures who’ve already clicked the link).
Via: Information Week