Not an effect I'd seen before, but incredibly powerful. Anyone know what it's called? @AkiyoshiKitaoka @agshapiro2pic.twitter.com/XxEl2gnW5D
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
another demo of the contrast-polarity reversed versionpic.twitter.com/7aC0afj89G
Strengthens it, I think
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.