The Federal Trade Commission claims that Facebook deceived developers over security ratings due to a lacking review and verification process, according to ZDNet. The investigation by the FTC found that Facebook did not take the proper steps to review applications the company was supposed to review which could have led to dangerous software getting promoted on Facebook.
The reports says "Facebook took no steps to verify either the security of a Verificed Application's website or the security of the Application provided for the user information it collected, beyond such steps as it may have taken regarding any other Platform Application." The rest of the report can be viewed here. There was no mention of a possible penalty for the social networking site.