Today social bookmarkings is one of the factor that will help your site increase its market. It may help both searchers and seo! For seo, this one good way to gain quality traffic and for ordinary people that they may find other people that shares same interest like themselves. But in terms of backlinks majority of them use nofollow on their links making them virtually useless for SEO. In your opinion - what is the SEO value of backlinks gained from bookmarking services and communities.