WhatsApp not affected.The power of FreeBSD and Erlang. ( Not sure if they are still on that stack )
Nope, nothing to do with FreeBSD or Erlang. Can't say what it is, but there are hundreds of other differences between which pieces of FB infrastructure WhatsApp uses vs. what other products use. This is in one of those hundreds. ;)
What always amazed me was the scale of this difference not being larger. Really fine engineering. ;)
Nope. Working fine in India.
Edit: Even FB is fine here.
Thailand: FB, Messenger didn't work till a wee while ago. No WhatsApp service interruption though.