If you are logged-on to your Facebook account and surfing the Web, your session cookie conducts this logging. The session cookie additionally records your name, e-mail address, friends and all data associated with your profile to Facebook. If you are logged-off, or if you are a non-member, the browser cookie conducts the logging; it additionally reports a unique alphanumeric identifier, but no personal information.
Thilo Weichert, data protection commissioner in the German state of Schleswig-Holstein, expressed alarm at how Facebook's technology could potentially be used to build extensive profiles of individual Web users.
"Whoever visits Facebook or uses a plug-in must expect that he or she will be tracked by the company for two years," Weichert said in a statement. "Such profiling infringes German and European data protection law."
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