>> The differentiator here is national security, > Which means that all countries other than the US also should be banning Facebook, and most US companies. Li

>> The differentiator here is national security, > Which means that all countries other than the US also should be banning Facebook, and most US companies. Like many sibling comments have already pointed out, many do. But the answer to your statement is "no." You're trying to pull an oversimple rule out of a pithy comment and neglecting other important distinctions. It's not just a black/white distinction like foreign country vs. domestic, but more more nuanced one like enemy country vs adversary country vs neutral country vs allied country vs domestic. The answer to the question "should country X ban Facebook for national security reasons" will be different for different countries based on their context.