Having all aggregate phone location data available for comparison would be useful in balancing that. If you could compare where people are to where they're sea

Having all aggregate phone location data available for comparison would be useful in balancing that. If you could compare where people are to where they're searching for you could figure out what new places people go to and what places they go to but don't search for. Rank places based on how often people go back there - sort of a geo-Backrub. Google and Apple obviously can have that data, but do privacy constraints prevent them from using it?