A Georgia Tech student, together with two of his roommates, claims to have hacked Yo, the Poke-like app that has set some of Silicon Valley alight (though not others) in the last 48 hours. The student emailed TechCrunch detailing what he alleges is the results of the hack: “We can get any Yo user’s phone number (I actually texted the founder, and he called me back). We can spoof Yo’s from any users, and we can spam any user with as many Yo. We could also send any Yo user a push notification with any text we want (though we decided not to do that).” Meanwhile, a Vine video has emerged, from user Hako, of the Yo sounding out a snippet of Rick Astley’s “Never Gonna Give You Up” instead of its normal “Yo!” sound. In other words, it’s what looks to be another hack, though this is not confirmed.