Thanks for your patience, the 500 error is now fixed!https://twitter.com/TeamYouTube/status/980889488531521536 …
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
Hmm. Try using Incognito Mode and see if that helps fix this. If nothing works, send feedback and we'll take a look: https://goo.gl/WdI0BK
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.