I picture how difficult it is for a woman to travel on her own in various countries from North Africa to India where she'll receive very unwanted attention from very brazen individuals. Not that it can't happen anywhere but it's much more prevalent. So that behaviour is coming online in spades and will continue to do so alongside the rise of (mainly) mobile internet for access for most who were less able to access the net previously (or, of course, not at all).  also, visas n passports...