Big problem with network effects is they tend to unwind just as aggressively as they start. WhatsApp is very popular amongst my social circles in Europe, but I

Big problem with network effects is they tend to unwind just as aggressively as they start. WhatsApp is very popular amongst my social circles in Europe, but I don't really know anyone who actively "uses FB" (as in posting content, actively friend requesting new people etc). I am sure they are still counted in MAU stats but are increasingly "zombie users", somewhat hooked on the addictive properties and notification spam FB delivers rather than getting actual value, which is unsustainable in the long run.