Appears a user tracking component from Pinch Media used by devs in a variety of apps in the app store is sending back a little more info than some people are happy with. You know, like your birthday, age, hardware ID and exact geographic location! (full overview here)
I have to admit, when I click the button to allow the device to use my location it’s never even occurred to me that this was a two way street and this info was being sent out and harvested somewhere. Naive perhaps but I’ll think twice from now on.
If you’re concerned about this issue, a good blog to keep an eye on is http://i-phone-home.blogspot.com/, which reviews apps based on their privacy. They also have a hosts file available (jailbroken phones only of course), which may be a better option than the suggestion from Pinch Media that we simply use all our apps in Airplane mode!