A point to add to the discussion from the metrics perspective: the net promoter score. Net promoter score is an easy tool you can use to determine trends in y

A point to add to the discussion from the metrics perspective: the net promoter score. Net promoter score is an easy tool you can use to determine trends in your users' experience. It can be used as a leading indicator of the 'N' part of your viral coefficient. eries goes in to detail in "Net Promoter Score: an operational tool to measure customer satisfaction" (http://startuplessonslearned.blogspot.com/2008/11/net-promoter-score-operational-tool-to.html http://startuplessonslearned.blogspot.com/2008/11/net-promot...). Additional reading from HN members: jfarmer's "Three myths of Viral Growth" (http://20bits.com/articles/three-myths-of-viral-growth/ http://20bits.com/articles/three-myths-of-viral-growth/)