From time to time, we get a reminder of the true power of social media, and the fact that sometimes that power is used by evildoers. The latest example comes a CNN report about a Facebook "hit list". According to CNN's Arthur Brice, three teenagers in Columbia, who were on a 69-name hit list posted on Facebook, have been murdered in the past ten days. He reports: The hit list on Facebook, which was posted August 17,