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AddThis helps website publishers and bloggers spread their content across the web by making it easy for visitors to bookmark and share content to their favorite social destinations. AddThis is fast, powerful and easy to install. Even better, it's free and offers sophisticated analytics to help users understand how and where their content is being shared.
Launched in 2006, AddThis has grown dramatically. In 2008 Add This, LLC was acquired by Clearspring Technologies, the leading widget network connecting publishers and advertisers to audiences on the social Web.
AddThis partners include JS-Kit, a powerful threaded commenting system that connects blogs to a community of over 600,000 sites, and Lijit, who enhance how readers search for information.

REFERENCE: http://www.addthis.com/