I don't know if you'd get the same quality of data, but it seems like you could get the same kind of data from a user's Foursquare (location) and Facebook page.

I don't know if you'd get the same quality of data, but it seems like you could get the same kind of data from a user's Foursquare (location) and Facebook page. Now that I think about it, I imagine most young people use Facebook messages/wall posts more than phone calls and texts. Or perhaps a browser plugin that anonymously reports browsing habits.