Not by IP, FWIW. I'm in Mountain View but the guy seemed to want to find me in Reykjavik, Iceland, where I'm from. (I moved to the Bay Area a month ago, but haven't update my FB)
This guy over here [1] claims the video tracked his last foursquare check-in. I'm guessing the location algorithm tries to find a best guess of where you might be — hence the inconsistent results.
