Social bookmarking is a kind of social software or website which is used for people to collect and share hyperlinks on the Internet. It is a new application of America Web 2.0. It is also called web bookmarking as most collected hyperlinks can be shared by most users on the web. In general, it has a great influence on search engine optimization. Bookmarks means one-way backlinks to websites, and if your website are collected by more users, and more and more people embodied your web bookmarking, thus it implies your website is becoming more popular. Although this kind of backlinks are not backlinks with high quality from the view of links value, it can also bring some visit traffic, and the spread speed is rather fast from one people to thousands of people.