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
That's interesting. I do roughly the same thing: basically add digits left to right, and occasionally correct where I'm at when there's something to carry. But if the numbers were on paper I'd probably go right to left. 
I'd do very different things with other 4 digit numbers. In this case it immediately seems to me that 58+24 and 84+39 are likely to be easy, so this is a good route. With other numbers I'd use different routes.
(TBH, probably affected by coming home from dinner, where I had a couple of glasses of wine. Less wine might mean more observant about the numbers, and so I'd choose a different route. Though that's entirely speculation.)
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
