Living and working in Silicon Valley, I know he has to take the threat seriously. The challenge for him, FB and all of the other social media sites is determining the point where a post stops being free speech and becomes a threat to others. This is not always easy. If it's too restrictive, then no one uses the site. If too easy, then their site is used to facilitate criminal acts (this is what terrorism is - a criminal act). Who sets these thresholds is another matter -- is it set by government or corporate policy. It is a challenging situation.
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