Social Marketing Is the New Black: Efficient Frontier's Karnstedt and Context Optional's Barenblat Discuss

Efficient Frontier, the online performance marketing firm, paid $50 million for social marketing start-up Context Optional.

Here are both company's leaders talking about why and what's next.

Paige Butcher Amanda Peet Xenia Seeberg The Avatars of Second Life Daniella Alonso