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How an EBS for Twitter could work
  An Emergency Broadcast System for Twitter might look like this.
  When everything is working at Twitter, all the clients communicate through Twitter. A client is an app like Tweetdeck, UberTwitter, Seesmic, Brizzly, Tweedroid, etc.
  However, when Twitter is down, each client sends your tweets to a "safe place" and the clients your friends use hear about your status updates from there.
  There's still a lot of disruption, but some messages get through. Over time the EBS will get better, as we learn better how to make the best of a Twitter outage.
  Reality: We still need to communicate even when Twitter is down.
  Bottom-line: The client vendors are key.
    5/20/10: "The secret for the client guys is that instead of investing in individual platforms owned by huge corporations, they must swallow hard and invest in working with each other."