The names and phone numbers of thousands of people could be in the hands of three students, after a messaging app called "Yo" was hacked in the US.
The app simply allows you to send the word "Yo" to anyone in your phone book. One example on the app's download page says:
"Wanna say 'good morning'? just Yo. Wanna say 'Baby I'm thinking about you'? - just Yo."
The Georgia student at the centre of the hacking claim, emailed technology news site TechCrunch, outlining what he had allegedly done:
Founder of Yo, Or Arbel,confirmed that the app was “having security issues."
A video of the hack, purportedly backing up the claim, was also posted to Vine.
Yo currently has over 50,000 active users and climbing rapidly, with an estimated four million Yo’s sent out since its birth, according to TechCrunch.