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
From memory (back to my first-year chemistry >10 years ago) it is in theory possible to make a substance with a pH of >20, but it would be so caustic that it would burn through pretty much anything and instantly kill you if you ate it
I am dying of laughing here 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.