Have been in Vietnam for 10 days and understand they have an "unofficial ban" on Facebook. I know there are ways around this, but I am not a technical person. However, I spent one night at a hotel in HCMC where it worked. Do I assume the hotel owner bypassed the block with his WiFi network . If that is possible, does anyone know of hotels in Hoi An, Hue, or Hanoi where this would be the case? If so, you could private message me to avoid implicating the places in question.