Iron Man actor Robert Downey Jr has nominated himself to voice Facebook founder Mark Zuckerberg's artificial intelligence, Jarvis.

"It's time to give my AI Jarvis a voice. Who should I ask to do it?" Mr Zuckerberg posted on Facebook.

Downey Jr commented: "I'll do it in a heartbeat if Bettany gets paid and donates it to a cause of Cumberbatch's choosing … that's the right kind of STRANGE!"

Actor Paul Bettany plays Iron Man's AI sidekick Jarvis, who Mr Zuckerberg named his after, in the film series.

Mr Zuckerberg responded: "This just got real."

In January, Mr Zuckerberg announced plans to create the AI to run his home and help with his work.

Mr Zuckerberg made the announcement in a Facebook post, saying he would teach the AI to understand his voice and "control everything in our home".

Mr Zuckerberg plans to create the AI to run his home and help with his work. ( Reuters: Robert Galbraith )

"You can think of it kind of like Jarvis in Iron Man," he said.

"I'll teach it to let friends in by looking at their faces when they ring the doorbell.

"I'll teach it to let me know if anything is going on in (his daughter) Max's room that I need to check on when I'm not with her.

"On the work side, it'll help me visualise data in VR to help me build better services and lead my organisations more effectively."

The 32-year-old said it would be a "fun challenge" to code the AI.