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Ding It’s Up is a unique service that provides you website downtime alerts via Twitter. You can get updates in your email, mobile or Twitter about when a site goes back up. The service sends you a message about the concerned website (that you entered), and you don’t even need to register for this service.

Ding It’s Up and more services like these are used by webmasters who have to monitor their own sites, though it’s also useful for people who are frequent users of Twitter, YouTube and other social tools/networks.