[johannes1234321]

There is not only that social form of "network effect" keeping in, but also the "free basics" network effect. I noticed that while travelling Asia: In many areas you got Facebook's limited form of free internet, where Facebook's services can be used even without money in the prepaid card. Thus WhatsApp is the central communication channel. Many shops, taxi/tuktuk drivers, guesthouse owners etc. use it as primary communication channel to make reservations etc. That lock in is strong. (One has to see how Facebook will monetize this, but we'll internet==free basics==Facebook+WhatsApp gives them a strong advantage.