Social bookmarking sites used like social search engines, bookmarks will be public, private, or shared with specific groups. Descriptions added to these bookmarks in the form of metadata, so users may understand the content of the resource without first needing to download it for themselves.
Directory bookmarking websites have transformed into dynamic online communities where users not only share and discuss links, but form discussion groups based on mutual interests. Business bookmarking services provide web feeds for lists of bookmarks, including lists organized by tags. Users applying tags or keywords to content on a Web site organize most social bookmark services. Here are the list of nice social bookmarking, directory submission, news and business listing sites: