LinkedIn member profiles embedeed in the website to help users discover common professional connections.
http://developer.linkedin.com/plugins
Widgets
Get access to data on 37,086 websites that are LinkedIn Member Profile Plugin Customers. We know of 12,173 live websites using LinkedIn Member Profile Plugin and an additional 24,913 sites that used LinkedIn Member Profile Plugin historically and 4,800 websites in the United States.
Get a list of 37,086 websites using LinkedIn Member Profile Plugin which includes location information, hosting data, contact details, 18,935 currently live websites which includes 6,762 domains that redirect to sites in the list. 24,913 sites that used this technology previously and 4,800 websites in the United States currently using LinkedIn Member Profile Plugin.