Probably the best known of the 'sharing button' services, AddThis' infographic is based on over 11m downloads, 1.2bn users and spans 350 different services.
The company says that Facebook makes up a massive 52.1% of AddThis sharing on the web, with Twitter under a third of that at 13.5%. Interestingly, Tumblr sharing has grown by 1299.5% and is still accelerating.
IE is still producing the most shares by browser, but Chrome is quickly catching up, surpassing Firefox back in November.
28% of all shares on AddThis for 2011 were related to the death of Osama Bin Laden, following by the US East Coast Earthquake, Royal Wedding and Hurricane Irene.