Information about the MobileMe to iCloud transition http://support.apple.com/kb/HT4597 (summary: MobileMe stays till June 30, 2012)
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
Information about the MobileMe to iCloud transition http://support.apple.com/kb/HT4597 (summary: MobileMe stays till June 30, 2012)