We tend to talk a lot about Facebook with its 600 million members and Twitter with their 200 million. The third major player aimed strictly at the business set, is Linkedin, who recently topped 100 million members. Unlike Facebook, where people will sit and engage one another for hours, Linkedin, is a solid professional place for businesses to see and be seen. Here is an infographic by OnlineMBA.com giving a wonderful visual overview of Linkedin.