Obviously this is a bit out of date (since it refers to Twitter), but I've always found this a good set of guidelines when something huge happens.
Very important
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Oh, in modern English, X is pronounced "Twitter".
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  1. All news is biased.
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What's the deal with #4?
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Both the Sandy Hook and Washington Navy Yard shootings had early false reports of second shooters. It's not that they don't ever exist -- see Colombine -- but they get overreported early on.
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