Charts are fun.pic.twitter.com/2UkHaMhK7n
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 doesn't say "720p" and I believe I have seen them state the same as VZW that it is whatever is sent by the stream.
during the earnings call today it was made clear the default would not be highest possible. Can always be adjusted
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.