> Doesn't Zuckerberg have full control of the board?
Zuckerberg has voting control of Facebook, in part due to some financial engineering in 2016 [1]. He does not control the Board.
Board members have a fiduciary "duty of care," i.e. "the duty to pay attention and to try to make good decision" [2]. This duty is to the company as a whole, not just its majority vote-holder [3][4]. (That said "American courts simply do not hold directors liable for business decisions, made without a conflict of interest, unless those decisions are completely irrational. The doctrine of noninterference is known as the business judgment rule." [2])
