I can confirm that Facebook is the Most Valuable Source of Traffic

SHOOT: Most of the traffic to SHOOT is from google and google.images. But the runner up is - you guessed it - Facebook. These are essentially folks who know the site and whom I've invited to come have a look see. The only frustrating thing with Facebook is folks tend to come back and comment on the link, rather than on the blog itself.

clipped from mashable.com Between search engines and social media, there are a lot of different ways that people can get to your website. But which of these sources provides loyal users that come back to your site multiple times? That’s the subject of a new study by ad network Chitika, who analyzed the browsing habits of 33 million unique users over the course of September. According to their findings, Facebook provides the most loyal visitors, with 20% of those that originate from the social network in turn visiting the site they landed upon four or more times in a week. Among other social media sites, Digg traffic produced loyal users 16% of the time, while Twitter traffic was only good for 11% loyalty.