It means you're using iOS 12 and you should update to 13.
We'll have an update out in an hour or two that fixes this bug in iVerify. Our bad!
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
We'll have an update out in an hour or two that fixes this bug in iVerify. Our bad!