Of all the falsehoods and distortions in the political discourse this year, one stood out from the rest. "Death panels." The claim set political debate afire when it was made in August, raising issues from the role of government in health care to the bounds of acceptable political discussion. In a nod to the way technology has transformed politics, the statement wasn't made in an interview or a television ad. Sarah Palin posted it on her Facebook page. Her assertion — that the government would set up boards to determine whether seniors and the disabled were worthy of care —...