Facebook boss Mark Zuckerberg passes down family heirloom kiddush cup

The photos posted show the little girl drinking from the cup, shots of Mr Zuckerberg’s Shabbat candles and some homemade challah.

With wife Priscilla Chan, Mr Zuckerberg has two children – Max and August, who was born last month.

Although the Facebook co-founder had in the past proclaimed himself to be an atheist, last year he said he recently realised the importance of faith and tradition.

In December he wrote: “I was raised Jewish and then I went through a period where I questioned things, but now I believe religion is very important.”

Giving the commencement address at Harvard University earlier this year, he told graduates that he sings the ‘Mi Shebeirach’ prayer to his daughter every night.