@MojangSupport this issue has been persisting since the Beta before this one. I can neither open Marketplace nor use templates/skins I own. All system information/whatnot should be at the top since I'm in the Betapic.twitter.com/5tdcGJYOu3
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
It was fixed in another Beta, but I forgot to mention it (my bad).
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.