Social plugins let you see what your friends have liked, commented on or shared on sites across the web. All social plugins are extensions of Facebook and are specifically designed so none of your data is shared with the sites on which they appear.
A. Hotho, R. Jäschke, C. Schmitz, и G. Stumme. Informatik 2006 -- Informatik für Menschen. Band 2, том P-94 из Lecture Notes in Informatics, Bonn, Gesellschaft für Informatik, (октября 2006)Proc. Workshop on Applications of Semantic Technologies, Informatik 2006.