There is a flash new kid on the social network block that is proving to not only be an engaging social pastime, but a powerful new digital marketing tool for businesses as well. Pinterest has taken the online world by storm. Growing by a whopping 400% from September to December 2011, it registered 1.6 million users in this short amount of time. Even more notable, statistics show that referrals from Pinterest grew from 2.5% in December to 3.7% in January topping the well-known Google Plus, YouTube and LinkedIn sites.