Thesis: What is the effect of social bookmarking on Bing results? We looked through our blog properties to find a blog with little Bing traffic. Added secondary tags to social bookmark sites and here's the result.
http://www.highrevenue.com/seo/socia...-quick-bump-up
It may be too soon to tell, there's usually a weekend dip in traffic but the initial results do look encouraging for people wondering about Bing's stance on social bookmark sites.
Enjoy!