Democratic Senator Al Franken, in a follow-up to his letter to Apple asking about the recently-revealed log of general user locations cached on 3G-enabled iOS devices, will hold a hearing on May 10th looking into the overall practice of how mobile OS companies collect, store and handle consumer data, AppleInsider reports. Representatives from Apple and Google are slated to attend, along with officials from the Department of Justice and Federal Trade Commission and various privacy advocates.