I am reading this article from a hotel room in Ubud, Bali, Indonesia. I  want to share a slightly longer than planned article about our journey  through four countries in Asia on our year long world travels. Over the  last five months, my family and I have travelled to UAE, Sri Lanka, The  Maldives, Thailand and Indonesia. Along this trip, there has been a  recurring theme that I haven't been able to shake, and that is that  WhatsApp is the silent force underpinning the Asian tourism market, and  no one knows about it.