Check out the transcript of Dave Kennedy (@CJCDave) and others on Collaborative Learning or Cheating.

Dave Kennedy, founder and chief consultant, participated in a Twitter discussion on the lines between collaboration and cheating.  It was through http://onlinecollege.org. You can see the summary here http://www.onlinecollege.org/2011/12/14/iolchat-report-collaborative-learning-or-cheating/.