Infografia Linkedin 2012

LinkedIn started in 2003 as a professional business social network and as of February 2012, has over 150 million members according to the official press release from LinkedIn.
More facts and figures:

2 new members join every second
USA leads membership at more than 57 million, Europe has more than 34 million members
60% of its members live outside the USA
In 2011 there were 4.2 billion professionally oriented searches on the LinkedIn platform
LinkedIn now has over 2,116 employees (at the beginning of 2010 it had only 500)
The fastest growing demographics are students and recent college graduates
Revenues for 2011 reached $522 million
LinkedIn is the 36th most visited website in the world

How LinkedIn Works by Infographiclabs