According to Symantec, certain Facebook apps have been inadvertently leaking "access tokens" to third parties, such as advertisers and
analytic platforms. Symantec estimates that close to 100,000 Facebook apps were enabling this leakage in February 2011. That said, Symantec believes it's likely that the third parties weren't even
aware of the consumers data mines at their disposal.
Alerted to the problem, Facebook has already taken action to block to leak. "But," according to PCWorld," some Facebook users might still be vulnerable to ... digital invasions of privacy."