When twittering, or otherwise posting a URL online, putting the http://www prefix on the web address will automatically be recognized as a URL and be made a link by various systems (e.g., Google's spiders, twitter's web interface, tweetie, etc.).
Facebook, for instance, automatically recognizes a full URL and makes it a link almost everywhere, and includes the page description and image in messages and wall posts. You can customize the default image, title and description that Facebook sharing uses too.
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