The first rule of Ecma is: don't talk about Ecma (using American English). Presumably later rules are about Oxford Comma being useful for something other than wasting bytes.pic.twitter.com/s5C5ya1i4N
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
I think BE is more commonly used and taught globally (at least in primary schools) so BE seems marginally better for accessibility in general.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.