Platlas - the Facebook Version [platlas.com] is not one of easiest interactive infographics around, as its attempts to provide a better understanding of the driving principles behind social media, and Facebook in particular. Branded as the "first ever social network ecosystem exploration tool", it starts from revealing the variety of actions users tend to take on the various social platforms available today.
The center is the user profile, from which users interact with the icons present in the inner-most circle. Each icon represents a specific area on Facebook, such as Events, Photos, or Apps. The outer-most ring then shows the different features that can be performed, according to the inner-most area. Lastly, the colorful dots represent actions, or ways users are able to interact with these areas. Tooltips then present detailed information about each shown keyword.
More background information is available here.