In a letter addressed to Facebook CEO Mark Zuckerberg, four lawmakers are questioning how the company handles user data, The Hill reports. Reps. Joe Barton (R-TX), Ed Markey (D-MA), Marsha Blackburn (R-TN) and Carolyn Maloney (D-NY) have asked the company to describe what personally identifiable information it collects, how it stores the data and whether the data is deleted upon a user's request. Citing reports of an Austrian consumer's request for his user data, the lawmakers said, "We are concerned that although the user was under the impression that this information was deleted at the user's request, Facebook continued to retain the information." Meanwhile, Facebook is investigating whether an influence-measuring site violated Facebook's privacy policies.    
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