> the company also has analytics based on a consumer panel of more than 70 million people in the U.S. — 10 million of whom that have opted into always-on locati

> the company also has analytics based on a consumer panel of more than 70 million people in the U.S. — 10 million of whom that have opted into always-on location sharing. I don’t believe it. 10M people opted in to be tracked? What exactly constitutes “opting in” in this case? I get the feeling foursquare’s whole business is built on tricking people into opting in to more than they expected. I wonder how many of this 10M are on Android. iOS will warm you when apps you aren’t using much are tracking you.