Stumbleupon is by far the most powerful, in my opinion. Then probably Digg, Propeller or Reddit. I don't consider any of them "bookmarking" sites. They are more social media.
Bookmarking sites are a waste of time for me. You have to get other people to bookmark them and that is not very practical unless your site is very popular...and if your site is very popular, you don't really need social bookmarking.
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