Hi everyone,
Recently we implemented the Social Sharing Plugin (AddThis) as a plugin for 2.65, 2.70 and 2.80 (http://store.novasoftware.com/products/plugins/social-sharing-plugin).
Social Sharing Plugin is the easiest way to let users share pages on your site to those social sites (Facebook, Twitter, LinkedIn and many more).
If you need any customzations or any other services, you can access our company's nopCommerce developer page for your reference.
Best Regards!