Social bookmarking is a grassroots process that allows users to establish the value of a specific web page, article, podcast, or video. By bookmarking an item, individuals are casting a vote to endorse that specific resource. The idea is that social bookmarking gives a resource credibility; the more users who bookmark a specific item, the more valuable the resource is considered to be.
Social bookmarking is all about the collective voice. Most of the social bookmarking networks increase the profile of items that receive numerous bookmarks. It probably won't be long before the major search engines begin to include social bookmarks as a part of their ranking algorithms.