It’s an online social site, not a major news outlet. It seems to be the perfect place to dispel rumours.
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Well, first, I doubt that more than a very small percentage of the American voting population ever even looks at Palin's Facebook page, and those who do are already supporters.
Second, as my beloved father, the good Reverend used to say, Remember, if the little critters are nipping at your ankles you have to stoop to their level to swat them.