The positive effects of social bookmarking for publishers of news sites, blogs, and other web sites is outstanding. Social bookmarking can introduce sites to others with relevant tastes, drive traffic to your site, and valuable backlinks. Some social bookmark sites pass on link juice, while some use the NoFollow attribute. But do not let the use of NoFollow fool you, the search engines are looking beyond the incoming links from social bookmarking sites to gauge their value to their search indexes.