mindgarden saidSome of the apps that have been caught at it include Hipster, Path, Pandora, Yelp, Foursquare, Angry Birds, and Foodspotting.
Here's a story from a year ago. And another with more creepy links. Such as this interactive chart from the WSJ.
That WSJ link is interesting. I don't use any of that stuff and I keep my location (but for 911) off on my phone unless I'm out of town and using GPS. I've got a friend who won't even use electric highway pay passes.
That's a little scary that these guys are tracking app users. That means they would also be able to track who your personal associates are if they have similar tracking apps. Just imagine if fascism ever kicks in big time. They'd start off with a crap load of into on people.
If they track longitude and latitude they probably also check altitude which means for some of you, if they haven't already gleamed the info off your grindrs, they already know who's been topping and who's been bottoming. So a warning for those who enjoy tricking outdoors: leave your phones in the car.