What is bookmarks? These are our favorite pages that are stored in the browser's menu, to keep track of and visit again frequently. When you find nice website you may add it to favorite, so if you want to come again to the website you don't have to type website address again. Browsers such as Internet Explorer and Firefox allow you to keep these links in menus and folders to organize your web browsing. Web developers often share these links with other users on their web sites. But the Web 2.0 transition brought a new phenomena known as "social bookmarking", where users and not just web masters can share their favorite links with others. Other visitors to the site can rate, vote on, or share their own links, as well as writing comments and other remarks about the sites or analysis involved. These kinds of web sites have become more and more popular over the last few years..