You may have heard of Yo. It launched as a mobile app that allowed you to send the message "Yo" to other people on the app. A frenzy erupted somewhere along the way. $1.5 million in funding was raised. Confusion reigned. Then Yo began announcing new features effectively ending its run as a single action app. Suddenly the picture becomes clearer and another brief moment of novelty fades into business as usual. More money? More features! Popular communication app? Opportunity for music marketing! If you haven't heard because you were too busy having a life, Yo was the app that...

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