Privacy is a major concern in social media these days, and location-based services add a whole different element to the equation (we can't wait to see what happens when Facebook unleashes its location feature). Check-in app posterchild Foursquare has made some changes to its own privacy controls. "For example, you can now choose to share your email or phone number with friends, opt out of all Mayorships, and have more control over email settings," the Foursquare team says .