Friends and business don't mix: A Harvard Business School study found that pals make the most unstable founding teams. There's no better example than Facebook. Two college buddies start a website, and then, millions of dollars and users later, they hate each other and get entangled in a nasty lawsuit. Facebook ended up thriving, and we got an entertaining movie about the juicy drama, but a friendship was sacrificed. It doesn't have to be end that way. Claire Mazur and Erica Cerulo were best friends when they started the online retailer "Of a Kind" in 2010. Six years later, the friendship and company are both intact. Bed Bath and Beyond acquired the shopping site last summer and Claire and Erica still see each other almost every day. How do they do it? It's work. They share the secrets with Rebecca and Sam on this week's show.

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