In Windows 8, you can configure your system privacy.
You can get to this from the
Charms >
Settings >
More PC Settings >
Privacy
Inside Windows 8: PC Settings - PrivacyYou can adjust decide the following:
■ To let applications use your location
■ To let applications use your name and account picture
The third one is interesting:
It says "
Help improve Windows Store by sending URLs for the web content that apps use"
I'm not sure this will be in the RTM version.