I feel that article is no longer valid given that it's written in June 2012 while WhatsApp got acquired in 2014. Things have drastically changed since the Faceb

I feel that article is no longer valid given that it's written in June 2012 while WhatsApp got acquired in 2014. Things have drastically changed since the Facebook acquisition and I've particularly seen my facebook profile being "enriched" by data from WhatsApp (specially when it comes to adding friends). WhatsApp might not be using it for ads within the app but it is surely contributing to building a user/marketing profile on facebook.