2000 Social Bookmarks + 15,000 Profile Backlinks -> $35 - Social bookmarking can generate some additional traffic to your website. You will receive traffic from social bookmarking sites you’ve submitted to. Especially if your submitted stories get many attention and it will automatically force your story urls into front page of social bookmarking websites.
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Pligg is an open source content management system that lets you easily create your own social network.