Facebook has offices in Dubai, Mumbai, Hyderabad, Singapore. These restrict internet pornography by law; even though much of actual Internet traffic may still be porn, businesses do not wish to associate with it because porn could provide a too convenient legal handle to prosecute representatives or shut down services as a retaliation for publishing things that are e.g. critical of the local government.

Of course we are not talking about porn, but drawing lines in the sand is a murky business.