Don't forget viral cycle: http://www.quora.com/Viral-Growth-and-Analytics/What-is-the-definitive-way-to-calculate-viral-coefficient-for-a-social-game http://www

Don't forget viral cycle: http://www.quora.com/Viral-Growth-and-Analytics/What-is-the-definitive-way-to-calculate-viral-coefficient-for-a-social-game http://www.quora.com/Viral-Growth-and-Analytics/What-is-the-...