Zuckerberg challenges himself to visit all US states in 2017
Facebook CEO Mark Zuckerberg, who takes a personal challenge every year, has set a challenge to visit and meet people across all 50 US states by the end of 2017. Zuckerberg says he has already visited many states and needs to visit 30 states to complete challenge. During previous challenges, Zuckerberg ran 587 kilometres, read 25 books and learnt Mandarin.