It has been observed that he wears the same T-shirt with the same colour and style everyday. According to him it would be a waste of valuable time to wonder on what to wear when there's still much to do looking after the world's largest social network.
Here's what he has to say:
I really want to clear my life so that I have to make as few decisions as possible about anything except how to best serve this community.
I’m in this really lucky position where I get to wake up every day and help serve more than 1bn people, and I feel like I’m not doing my job if I spend any of my energy on things that are silly or frivolous about my life, so that way I can dedicate all of my energy towards just building the best products and services.”