This is an empirical claim. It happens to be false.https://twitter.com/SpeakerRyan/status/904008582290710528 …
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
And, the degree to which it's true can vary quite a bit. While I think mobility in the US needs lots of improvement, it's far from the worst
To the tune of U-S-A "Far from the worst!" "Far from the worst!" "Far from the worst!"
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.