I've had this (perhaps strange) thought where I am able to see my entire life traced out as my wanderings in two dimensions across the surface of this planet. Others too, for example co-workers I would come to know, girlfriends (ex-girlfriends as well as the one that would become my wife) and friends, relatives too would be traced — synchronized in time.

Watching the whole thing sped up and perhaps you begin to see life, or parts of your life anyway, as the humdrum of commuting, daily to and from the same job, same grocery stores, etc. — back and forth. Then punctuated occasionally, briefly, by a road trip, a trip abroad, or a permanent move to a new city (and new routines, cycles).

And then you get to see if there were ever tiny instants where you crossed paths, unknowingly, with a future wife/lover/coworker. Relatives who die: their traces drop off....

I know, I'm on a tangent here and this app was probably not designed as a tool for some sort of avant-garde pipe dream. But when you asked about why I would be interested in location data, that's what crosses my mind. :-)