Reps Markey, Barton ask Facebook to explain security vulnerability

Reps Ed Markey (D-MA) and Joe Barton (R-TX) have asked Facebook Inc. CEO Mark Zuckerberg to explain a security vulnerability that gave advertisers and other third parties access to users' accounts and personal information.

They say they want to know the magnitude of the security problem and what, if anything, Facebook has done to inform users, among other things. "While Facebook reportedly now has fixed this particular issue, we remain concerned about how the problem arose in the first place, was allowed to persist undetected for such a long period of time and could recur in some form in the future," they said.