Legally they have no obligation but IMHO Zuckerberg does have an ethical obligation to uphold freedom of speech, particularly as a citizen of a country founded

Legally they have no obligation but IMHO Zuckerberg does have an ethical obligation to uphold freedom of speech, particularly as a citizen of a country founded on the principle. Facebook is as influential and dominant over information as the U.S. government has ever been. Responsibility comes with power and money is Facebook's only motivation here. They're worried about the financial repercussions of upholding this most sacred of American principles. They fear the backlash from least principled people among us, people that simply can't comprehend the concept of defending even your sworn enemy's human rights. Zuckerberg is compromising his own ethics for money, clearly proving once and for all that he truly cannot be trusted great power. An intelligent billionaire that is unwilling to stand up to a mob is truly a sad excuse for a human being.