Social bookmarking
Social bookmarking is a way for internet users to store, classify, share and search Internet bookmarks. From a search engine optimization perspective, social bookmarking represents ample opportunities for your websites to get noticed. Simply submit yours posts to social bookmarking sites such as Digg and del.icio.us and users on these social bookmarking sites might find your posts. If your posts do get popular through this method, usually the traffic doesn’t last long. However, in the process you just might be able to retain some extra new readers. Remember don't spam social bookmarking sites for the sake of gaining traffic.