sql exercises idea: take a table and some queries and write down the results by handpic.twitter.com/2Fr0YwhsQc
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
which part is mysql specific?
`GROUP_CONCAT` is for sure. COUNT(DISTINCT) isn't MySQL specific, but also isn't supported by all SQL DBs.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.