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On Thursday, conservative undercover journalist James O’Keefe released the second installment of his “To Catch A Journalist” series, a takeoff on Dateline NBC’s “To Catch a Predator” sting aimed at discrediting mainstream journalists. His first swing, at Sam Stein, missed badly, and his second attempt, aimed at NYU Prof. Jay Rosen and Clay Shirky, brings the count to 2 and 0. Prof. Rosen, however, responded to O’Keefe’s attack with some revealing information about O’Keefe’s “investigation.”

What does it mean to have a million Twitter followers? Does is matter? And why is it similar to attending your own wedding? On NPR’s Weekend Edition yesterday, Shirky gave a great explanation about how and why Twitter is such a powerful tool for those in the media world beyond telling people about the contents of your breakfast.