Which is the Best Social bookmarking tool

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ADDthis This sharing tool that is designed to give you up-to-the-minute stats on sharing trends, top content shared, top services, and top continents. Some other features being largest collection of social services and utilities like Print, Translate, and PDF Online, option of using in over 50 languages, private, safe and secure and shared flash widgets
ADDtoSocial This is a neat little social bookmarking site which has provided a great way for people to interact and post updates. Allowing users to create simple websites called for others to read about their special interests or topics. Just in case if you are promoting a certain niche interest, you can create a page to promote this idea and include links back to your sites.