I have a straight question, i'm more concerned about direct(referral i.e.) traffic being generated from a particular social bookmarking site.

I submit my article links to around 25 sites after its indexed and get an average of 25-200 visitors from these sites.
The sites that get me max traffic are Sphinn, Fark, Linkagogo and Stunbleupon.
What about you'll? Which social bookmarking sites get you'll the most traffic?