If you're not seeing the FaceTime option on your iPhone 4: http://daringfireball.net/linked/2010/06/25/facetime-settings /via @j4mie
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
If you're not seeing the FaceTime option on your iPhone 4: http://daringfireball.net/linked/2010/06/25/facetime-settings /via @j4mie