over 30 million people in a 30-day period of time. Bibliography Impact: How to Get Noticed, Motivate Millions and Make a Difference in a Noisy World, Career Press, May 1, 2008 The Impact Factor: How Small Actions Change the World, Action Plan Books, May 2012 The Impact Manifesto: You Make A Difference Whether You Want To Or Not, ChangeThis.org (a brainchild of Seth Godin), August 7, 2013 References External links Official website 1950 births American businesspeople Living people American male writers