The apply with linkedin button allows you to apply for jobs on LinkedIn.
http://developer.linkedin.com/plugins/apply
Widgets
Get access to data on 1,355 websites that are Linkedin Apply Button Customers. We know of 382 live websites using Linkedin Apply Button and an additional 973 sites that used Linkedin Apply Button historically and 76 websites in the United States.
Get a list of 1,355 websites using Linkedin Apply Button which includes location information, hosting data, contact details, 469 currently live websites which includes 87 domains that redirect to sites in the list. 973 sites that used this technology previously and 76 websites in the United States currently using Linkedin Apply Button.