Work/Life Balance at Facebook

I am interested in learning about work/life balance at Facebook, particularly within the Legal team. How often do employees work during nights, weekends and holidays? Do people take all of the allocated PTO and maternity/paternity leave time? How flexible are the hours- do you have to be available 9-5 M-F or is there flexibility as to when and how you work? #worklifebalance #facebookbenefits