Recently caught promoting themselves or their causes have been a handful of chief executives and political operatives, a critic for a major magazine, as well as dozens of lesser-known bloggers, authors and entrepreneurs who sneak changes onto their own entries on Wikipedia or the reviews of their books on Amazon.com. This digital-age deception has a name, "sock-puppeting," and a precise definition -- the act of creating a fake online identity to praise, defend or create the illusion of support for one's self, allies or company.