ethics, for one. also, FTC rules: http://mashable.com/2009/10/05/ftc-blogger-endorsements/ http://mashable.com/2009/10/05/ftc-blogger-endorsements/ http://bu

ethics, for one. also, FTC rules: http://mashable.com/2009/10/05/ftc-blogger-endorsements/ http://mashable.com/2009/10/05/ftc-blogger-endorsements/ http://business.ftc.gov/advertising-and-marketing/endorsements http://business.ftc.gov/advertising-and-marketing/endorsemen...