Social bookmarks are part of the social media revolution that lets customers bookmark their favorite websites, articles and online content. Essentially, a social bookmark is like a "vote" for your website. The higher the number of people who save your website using popular social bookmarking sites, the more important your website becomes in the "eyes" of the search engines.
Social bookmarking can be a powerful tool that can increase your website's rankings and enhance your overall online visibility. Popular bookmarking sites such as Delicious, Digg, Reddit, & Stumbleupon lead the list of bookmarking sites.