At first it seemed like nothing more than hype — as early as last week critics were calling foul, accusing shivering ice bucketers everywhere of "slacktivism" — doing something to make themselves feel good, but not really making a difference. But now the numbers are in on the viral sensation of the ice bucket challenge — in which friends dare each other on social media to dump a cooler of ice over their heads or donate money to the ALS foundation, or both. And the numbers are real.