I promised myself I wouldn't talk about Yo. Have you heard about Yo? It's an app that sends the word ''yo to your friends. Or to whomever, as long as you don't want to say more than ''yo. It was developed by two people in eight hours, and within days acquired over a million users, and raised $1.2 million in venture capital. Why? Traction, viral spread, and a user acquisition cost of almost nothing are...
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