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years ago when I left the building my doctor is in, in a street full of doctor's practices, google asked me to rate my doctor using his full name.

the building has many floors and practices. knew my doctor by name. knew I was there to visit him. wanted me to rate him.

very creepy.

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I mean check-in technology is at least as old as dodgeball (foursquare predecessor acq by G). G + FB both have check-in based features.

gps includes altitude (albeit gps isn't that precise in cities). phone geo can use cell tower triangulation + wifi scanning, on both aapl + droid, whether or not you connect to wifi.

i.e. they have lots of ways

What's your hypothesis?

Almost certainly they'd searched for that doctor to get directions?

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