Fast Addthis
Fast Addthis Joomla Integration is a plugin that lets you share your Joomla Articles on Facebook and Twitter without affecting the loading speed of your website, as no libraries or widgets are loaded, everything is done through Addthis Oexchange.
Addthis Oexchange is a set of URL API'S that let you share your webpage trought simple links.
Fast Joomla Addthis Integration allows you to set up your Addthis Profile ID, customize the plugin's CSS, configure the articles you don't want to have the share code and the plugin position within the article.