You're lucky. A more creepy way of getting enlightened is having Google Now tell you, "I see you're at work, and it's about your usual time to head home. Traffic is heavy on the usual route, though, so it might take 15 minutes longer than normal."

(This all without you ever telling which location is your work and which is home.)

They're doing this based in wifi networks for the most part.

I actually really like answering the questions they'll give you sometimes about places you've been. Did that restaurant last night have a great cocktail selection? Was the store handicap accessible? Great info for people to be able to look up and it makes a lot of sense to crowd source, and is probably more reliable than reviews which are so heavily selected for people with extreme opinions.