Yo been hacked! The free iOS and Android messaging app created to literally say only, "Yo," has some serious security issues, which several people appear to have exploited in the past few days and Yo founder Or Arbel acknowledged earlier today (June 20).- Three students at the Georgia Institute of Technology say they can access any Yo user's phone number, apparently by username. The Georgia Tech students also found a way to make Yo say more than just Yo — sort of.

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