StumbleUpon gives me great REFERRAL traffic - and I do use Digg. But I don't use them to boost my site(s) up in the SERPs - because it just doesn't happen.
My personal opinion - and please - I'm not trying to be mean - but if your going to post links in 100 Social BM sites - your wasting your time.
social-bookmarking-sites-list.com is very good to use. But don't try to submit too much to social bookmarking sites because it is waste of time. Just submit to the best social sites.
The best social bookmarks is: Digg, Facebook and Twitter, but you can't make 100 dofollow links.
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