I don't think it will be effective to do this secondary sanctions. If Chinese company want to sell aboard then Facebook isn't something easy to circumvent. And

I don't think it will be effective to do this secondary sanctions. If Chinese company want to sell aboard then Facebook isn't something easy to circumvent. And they can always go to Singapore to do business with it, or find agency there. It is will be hard for government to monitor such activities. Facebook by all means is already banned.