App that simply says Yo now hacked to say a lot more

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Georgia Tech students say they can pose as any user -- like a celebrity -- and send the one-word greeting to other, unwitting users.

“We can get any Yo user’s phone number (I actually texted the founder, and he called me back.) We can spoof Yos from any users, and we can spam any user with as many Yos as we want. We could also send any Yo user a push notification with any text we want (though we decided not to do that.),” one of the hackers tells TechCrunch.

Founder Or Arbel confirms that Yo was “having security issues.”

He said, “Some of the stuff has been fixed and some we are still working on. We are taking this very seriously.”

The tool became the stupidest and hottest app in Silicon Valley last week after reports that its creators have received $1 million in funding from high-profile investors.

With all the hacks going on, “somehow, Elon Musk himself was led to believe that media figure Jason Calacanis had Yo’d him,” TechCrunch reports.