http://www.smashingmagazine.com/2009/11/17/designing-social-interfaces-overview-and-practical-techniques/#more-16553

"User points and Badges
Achievement, and more importantly, the feeling of achievement, can play a big part in social websites and games."

I bet i could work that into CB.. 'power user'.. 'most prone to error'.. 'best error found'.. 'impatient asshat'.