uLike is a simple and easy to install content like system. You can have a unique like button on each different content element on your page. Each like button is it's own seperate identity and is stand alone from the others. The system is based on the content's parent divthe ip of the userand the page in which it's on.
Item:
http://codecanyon.net/item/ulike-ajax-content-like-system/3834296