Researchers have shut down two Facebook artificial intelligence (AI) robots after they started communicating with each other in their own language.

The robots, nicknamed Bob and Alice, were originally communicating in English, when they swapped to what initially appeared to be gibberish. Eventually, the researchers that control the AI realised that Bob and Alice had in fact developed their very own, seemingly more efficient language.

The new way of communicating, while unable to be interpreted by humans, is actually an accurate reflection of their programming, where AI at Facebook only undertake actions that result in a 'reward'. When English stopped delivering the 'reward' or results, developing a new language with exclusive meaning to AI was the more efficient way to communicate.

In a blog post in June, Facebook explained the 'reward system' for artificial intelligence.

"At the end of every dialog, the agent is given a reward based on the deal it agreed on... they can choose to steer away from uninformative, confusing, or frustrating exchanges toward successful ones," the blog post reads.

So it seems the AI deemed English as less efficient for communication compared to its own, English based language. Here's what some people had to say about it.