Social bookmarking allows users to easily bookmark and share web pages with friends. It provides benefits to both users and businesses. For users, it makes bookmarking and reminding themselves of pages simple. For businesses, it leads to more external links, faster search engine indexing, higher search rankings, and increased traffic. Social bookmarking services like Delicious and StumbleUpon allow sharing bookmarks, calendar events, and RSS feeds. This new form of social networking enabled by bookmarking provides opportunities for content enrichment and personalized advertising.