Facebook has admitted that its Beacon ad system is tracking users even when they've logged off the site, PC World reports. Even those who opt out of the system that broadcasts activities to friends are being monitored. The company's email announcement reverses earlier denials and will likely stoke criticisms of the system by privacy advocates.
Until being outed this weekend by a CA Threat Research engineer, Facebook execs claimed that data about non-Facebook activity at partner sites—including eBay, Fandango, Blockbuster, and Travelocity—couldn't be tracked after users logged off the site. The social networking site now says that data culled in this manner is dropped into its servers and deleted.