Gary Vaynerchuk

Initially having found success as a video blogger - his wine show attracts 80,000 viewers daily - the "social media sommelier" is out to conquer the world with TV appearances, a Hollywood agent, and a book already in sixth place on Amazon's Cooking, Food & Wine section.

In keeping his fans constantly abreast via e-mail, Facebook, Twitter, and countless other social networks, Vaynerchuk has developed as ubiquitous a presence online as Jamie Lee Curtis has in those commercials for the yogurt that makes you poop.