There are so many social bookmarking sites out there that you would expect would have do follow links, and then when you take a look, they are totally unhelpful for SEO.
I only know this because I have a special SEO toolbar on my Firefox browser from SEO Book. It's a good thing to have.
Some of the sites I have found which are useless are Extraplay, Mister Wong, Netlog, and I'm sure you know that Twitter and Facebook have no follow links, but Google does still give some weight to these links anyway.
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