I think the litmus test is whether or not what is being said can cause harm to others. I've personally never heard of anyone being silenced for criticizing the government.
Groups or people who claim their freedom of speech is being suppressed due to FB or some other large social media platform, seem to forget that their are numerous ways to get their message out. TV, radio, newspaper, email, snail mail, magazine, text, video conferencing, personal blog, sign on a stick, billboard, rent a hall and invite people in for free, etc., etc.