There’s a strange app swimming out there. It’s called Yo. What does it do? It allows users to send ‘Yo’ to one another.

That’s it.

Moshe Hogeg, CEO of Mobli, was basically sitting around one day and asked Arbel, a coworker, to create for him an app that would allow him to summon his personal assistant with the press if a button. Eight hours later came Yo.

Believe it or not, it’s been able to garner over a million dollars from investors. Apparently the creators view it as the new way of receiving notifications. Get a Yo when your triple tall skinny no foam hazelnut latte is ready. Get a Yo when Netherlands scores another goal in the world cup, dashing the hopes of billions.

But please do not download this app. Not because I’m telling you it sucks, but rather because it has been hacked. Indeed, a handful of Georgia Tech students have since been able to retrieve users’ phone numbers and spam them with a deluge of Yos or Rick Rolls.

Well, I’m sure you didn’t expect a program written in eight hours to be super secure, eh?