The most social bookmarking sites allow through to shear the items based, category like "Blogging" and "Shopping Online" News and ETC. for new blogger user and webmasters are very impotent this topic to high page rank and traffic. Social bookmarking is a social connecting, to people service to use social bookmarking you send or shear your website links to social websites, and increase your search engine page ranking and traffic. and you can be shared people or groups privately on social media networks system. i will shear to you some Best social websites, below.
Twitter: is online social networking site. and Twitter is a very effective bookmarking service. to increase your page traffic and page rank. and twitter is a very big social media network in the world. and Twitter Estimated Unique Monthly Visitors are (320,000,000).
Pinterest: is place to share online images and text, and you create Boards for any topic what you want. Pinterest Estimated Monthly Visitors are (113,000,000).
Reddit: you also use this to share you social bookmarking, and Reddit Estimated Monthly Visitors are (110,000,000).
Tumblr: is also good and friendly for webmasters, you also submit your social Bookmarking to Tumblr. and (Tumblr) Estimated Monthly Visitors are (100,000,000). above.