"significantly moderately correlated" is my favourite term of the yearpic.twitter.com/PHuTX1u91O
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 what they meant to say was that the correlation was weak but statistically significant, but instead they made up a nonsense phrase 
Yes!
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.