Facebook caves in to Beacon criticism Facebook came under withering criticism from its users and privacy advocates alike when a security researcher revealed that the ad system tracks user activities on third-party partner sites -- including the activities of people who never signed up with Facebook, who deactivated their accounts or who were not signed on to the site. Dell to sell PCs at Best Buy Beginning in the next few weeks, Dell notebooks and desktops will be for sale at Best Buy, the companies announced Thursday.