Elon Musk has not been quiet in saying he has fears over the future development of AI if left unchecked. 

Zuckerberg recently waded into the debate in a Q&A and made it known he felt any such views were irresponsible. 

Musk responded via Twitter (where else?) that - ahem - Zuckerberg does not really know what he is talking about. 

With somewhat chronic timing then for Zuckerberg just this week two of his AI robots somehow started conversing in a language they made up. 

In a language the humans could not understand.

This was not meant to happen. 

Needless to say the plug got pulled on that project pretty quickly.