And speaking of GOOG maps, I never knew anything about the, "Your Timeline" feature until this week. I dont know if I'm the last person on earth to find this, but I definitely would have mentioned this in the recent, "creepy as hell technology" conversation, and had it near the top of the list.
Basically, GOOG knows EVERYWHERE you have been and stores it. If you go on vacation to California or Florida, etc... they know the dates you went, what hotel(s) you stayed at, where you ate, what entertainment spots you hit, they even log the driving route you took and how fast you drive!
I played with it for almost an hour & found it to be amazingly accurate. I only found 1 error - it claimed I've been to a place called Sheridan, Wyoming, and I've never been to Wyoming in my life. What seems to have happened is the phone picked up a "ping" on the decline in altitude / approach to SLC.
Anyway, it turns out your "location history" can be turned off, but I dont recall ever getting the option. And given what we already know about GOOG & FB etc... I doubt they even listen, they probably just keep it themselves but hide it from you so you think it's not being tracked. We'll learn that roughly 5 years from now!