Social bookmarking is a free online web tool to share your favorite articles, website links, photos and videos. Bookmarking services is just like a yellow page where your link will be listed. Sharing your contents through these social bookmarking sites can drastically increase the traffic to your blog/website. Many people prefer to browse through these bookmarking sites to get interesting articles. Sometimes this method is preferred over going through search engine. There are number of social bookmarking sites. Delicious, Digg, Reditt, Google Bookmark, and Stumbleupon are popular among them.