The left circle appears to be whitish whereas the right one blackish, though they are the same random dots of the same luminance.pic.twitter.com/JSspVObywH
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
Meh, doesn't seem to work on me. The areas around the objects are dark/white, but the objects themselves are the same color.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.