The leaders of smaller, fast-growth companies are more likely to use Facebook and Twitter than the CEOs of Fortune 500 companies, according to a CEO.com study. Large-company CEOs are inherently in an "ivory tower," but avoiding social media makes it even harder for them to understand important consumer trends, writes Josh James. "[B]y not having a social media presence, these giants are handicapping themselves when it comes to agility and growth," James writes.