Yo raises $1.5 million in another round of funding

The incredibly simple app Yo has raised $1.5 million in an additional round of funding with investors, just weeks after it raised $1 million in an initial round of funding. The fact that Yo now has a multimillion dollar valuation is somewhat mind boggling, given that the app performs one minor action: it allows you to send a Yo notification to other users that have the app installed. 
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