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The problem is, a lot of those sites will allow search engines to follow the links. This is a way to get people to sign up and submit their bookmarks.
But after the sites gets enough members and traffic, they will usually start using the nofollow tag.
I have just about stopped signing up at new social bookmarking sites. It seems that I waste a lot of time by signing up, submit,,,, and then have the site start using the nofollow tag a few months later. Its not really fair to the members to advertise as a "dofollow" and then switch to a "nofollow" later on and not tell anyone.
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