20 Largest Social Bookmarking Sites

On SEO things we know about social bookmarking, i`m not good SEO, i am learning on it now, i am the new beginner. Here i have some source that connected with SEO things like social bookmarking. According to wikipedia :Social bookmarking is a method for Internet users to store, organize, search, and manage bookmarks of web pages on the Internet with the help of metadata. In a social bookmarking