When building a brand, these entrepreneurs have learned that honesty can be the best policy. Gary Vaynerchuk, founder of Wine Library and VaynerMedia, explains the importance of consistency in an age where " everything is on the record." Responsiveness is also critical, according to Joe Fernandez, founder and former CEO of social media tracking platform Klout. He shares a strategy for boosting your brand's influence online. And Caroline Ghosn, founder of career advice site Levo, says professionals of all levels should develop an authentic voice -- and use it often.