Mark Zuckerberg had a great piece of advice for a grandmother about her granddaughter dating nerds

Mark Zuckerberg had an excellent piece of advice for a grandmother who joked about persuading her granddaughter to date a "nerd" at school.

In case you missed it, the Facebook CEO announced on Sunday that he's building a robot butler.

Every year, he sets himself a challenge to help improve his life. In the past, he has learnt Mandarin, and read two books a month. In 2016, he says he will "build a simple AI to run my home and help me with my work. You can think of it kind of like Jarvis in Iron Man."

In the comments below his Facebook post, messages and questions poured in from Facebook users.

One user - a grandmother - posted the comment: "I keep telling my grand daughters to Date the nerd in school, he may turn out to be a Mark Zuckerberg!"

But Zuckerberg recommended that they do one better: "Encourage them to *be* the nerd in their school so they can be the next successful inventor!"

Boom!