I was reading a post on ReadWriteWeb that lists Facebook’s top advertisers in 2010.
The number 3 Facebook advertiser on the list is a company that somewhat misleads people into installing a browser toolbar that is not easy to uninstall. I will let you read more about Facebook’s 3rd Biggest Advertiser in 2010 on your own.
If you are one of those people that does not know how to uninstall the Zugo Toolbar, here is a link to the Zugo website that may solve your problem: http://www.zugo.com/uninstall/
Good luck.