@f275d986 very true, but as I pointed out about the network effect, it is called that because that is how the majority of people operate - they stay where most of their friends are.

I've moved to some of the best private networks around, but not a single one of my friends is prepared to move there - I've had one try a network and then they disappear. For a messaging network to be popular, it needs users friends there too. That's just life. 

 @771c7916 Yes, I know that. This is also called a crowd psychology which causes a very simple and efficient as well effects if properly maintained and done. That's why people are doing so.