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
because if the distribution of returns isn't normally distributed it's a meaningless number. It's supposed to represent something (i.e 1 std = 68% of events, 2 = 95%, etc) but if the tails are way longer and flatter than a normal distribution the number doesn't mean anything.
I have no idea where you are getting this from but it's completely wrong. It's only meaningless if the distribution doesn't have a finite second moment. Otherwise st dev has a perfectly sensible meaning as the square root of the second central moment.
The correspondence between std deviations and quantiles (e.g. 1 sd = 68%, 2 sd = 95% etc) is true for the normal distribution but so what? It doesn't mean you can't use the standard deviation for other distributions. Just a massive misunderstanding on your part.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
