Apple and Google today made a repeat appearance in front of the US Senate, newly joined by Facebook, for a subcommittee on mobile privacy. The corporations largely stuck to earlier positions in defense of their actions. "Apple does not track users' locations -- Apple has never done so and has no plans to ever do so," said Apple's VP of government affairs, Catherine Novelli. Criticisms of the company have circled around a cache of Wi-Fi and celltower locations, which until an iOS patch was released extended almost a year back.