Yo, an app whose function consists solely of messaging the word yo to other people — and whose rise says a lot about the overwhelming absurdity of Silicon Valley — has been hacked. TechCrunch reported on Thursday evening that three Georgia Tech students had claimed to gain access to the apps phone numbers. One of them told the site that “we can get any Yo user’s phone number. Yo founder Or Abel later confirmed that his app was undergoing security issues, and that some of the stuff has been fixed and some we are still working on.