Quick! Where were you last Tuesday at 6:35 PM? If you’re anything like me, your answer is probably along the lines of “I… have absolutely no idea.”..
But odds are, Google knows. They probably know where you’ve been most other days, too. And they’ll happily show you, letting you relive your life one step at a time.
If you carry any Google-filled gear (like, say, an Android phone or tablet), there was a prompt during the initial setup that asked if Google could transmit your location data back to the mothership. This is that data. You know how Google Now can auto-magically figure out where you work and warn you about traffic?
This is the data that makes that possible (or at least a good chunk of it.)
Via Gust MEES