> - China / Russia... used some kind of "Great firewall" Also add to the list UK, DE, CH, IT, BG, probably others in Euro area. Implementation varies, but most

> - China / Russia... used some kind of "Great firewall" Also add to the list UK, DE, CH, IT, BG, probably others in Euro area. Implementation varies, but most of the time DNS level blocking, sometimes plain old ACL to block IP. Varies on country-per-country basis. Source - I consult ISPs across the world (fortunately not about blocking).