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"First, a guide to Twitter shorthand. You will see examples of these in the sample tweets that follow: @username: creates a link to that user in your post. RT: Retweet, to copy someone else's post in a new update. Give them credit by adding their @username. #: hashtag, helps to organize your tweets into categories for easier searching. DM: Direct message, send a tweeter a private message instead of an update that all your followers can read."

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