jQuery Pinterest Pin It Plugin looks for all images, and wrap it inside a container that come with a pinterest Pin it button. So, your visitor just have to hover above the image they want, and pin it straight away. It's a simple plugin.
Sharrre is a jQuery plugin that allows you to create nice widgets sharing for Facebook, Twitter, Google Plus, Digg and Delicious and more. The plugin calls the social buttons on demand which is great for minimizing the number of initial requests and improving loading speeds.