AOL co-founder Steve Case's Revolution Growth fund has invested $22 million in Sweetgreen, a fast-casual healthy salad concept with a focus on seasonal and organic ingredients. In this CNBC interview, Case said he has watched as the Washington, D.C.-based chain has grown from a single location in 2007 to 22 stores in D.C., Maryland, Virginia, Boston and New York. "It already has demonstrated that what they're doing resonates," Case said.

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