Where do bloggers get their biggest levels of traffic?

Darren Rowse of Problogger asked his readers publishing blogs where they got their biggest levels of traffic. The results are displayed below.

I find it pretty interesting, like Darren, that social media sites are the number 1 source of traffic for 15% of bloggers. I also agree with Darren that if he asked the same question 18 months ago social media sites would have barely registered on the results.

We’re always a little lagging in the legal industry. I am finding some blog traffic coming from social media sites such as Twitter and Stumbleupon, but I’d guess it’s only 5 or 10% of my traffic. Most of my traffic comes from people coming directly and by others mentioning a post of mine in their blog or online publication.

Where does most of your blog traffic come from?