JANUARY 2012 UPDATE: http://www.slideshare.net/amover/linkedin-demographics-statistics-jan-2012
A document about LinkedIn. It shows the number of members worldwide (over 100 million members) with a breakdown by area and countries.
It also shows sex and age in area and job fuction/industry distribution worldwide and by area
Clipping is a handy way to collect important slides you want to go back to later.