"Michelle Obama's tweeting #BringBackOurGirls for the nearly 300 schoolgirls kidnapped by Boko Haram terrorists poses an interesting case of the semiofficial tweet," writes Charles Krauthammer. (Ben Curtis, The Associated Press) Mass schoolgirl kidnapping in Nigeria — to tweet or not to tweet? Is hashtagging one's indignation about some outrage abroad an exercise in moral narcissism or a worthy new way of standing up to bad guys? The answer seems rather simple. It depends on whether you have the power to do something about the outrage in question. If you do, as in the case of the Obama administration watching Russia's slow-motion dismemberment of Ukraine, it's simply embarrassing when...
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