@jw i.e., iPhone client is in some sort of corrupted state that a restart doesn't fix. Probably a stale value being stored in user defaults.
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
@jw i.e., iPhone client is in some sort of corrupted state that a restart doesn't fix. Probably a stale value being stored in user defaults.