Sarah Palin carefully moderates her Facebook feed to ensure that critical comments are weeded out quickly, writes John Dickerson. Using a software tool to spot deletions, Dickerson found that roughly 10% of Palin's followers' comments were swiftly deleted -- and interestingly, Palin axed comments that were too fervent in their support of her ideas, as well as those that criticized her. "Palin is a polarizing figure, which makes this kind of curation necessary to guard her reputation and keep her from being linked (literally if not figuratively) to anything controversial," notes Dickerson.

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