Because they have developed or are developing software to allow the Chinese government to censor Facebook in China. This is their commitment to free speech, eh?
Zuckerberg says it is better to be “part of a conversation”, which is Silicon Valleyese for “we can’t make a profit in China unless we let the government screw with our members’ values.
It is good to read that some FB employees are quitting in protest but, frankly, FB can simply offer more money to attract more coders and systems managers whose resumes do not include any social conscience.
Previous Reasons NOT to Use Facebook.