That could explain why I've been getting oddly accurate (highly targeted) ads on FB related to the niche of a new app I'm developing. I haven't liked similar stuff on FB and I was wondering how in the world FB knows that info (I have talked about it extensively via whatsapp). So there are only 2 options:

1- They somewhat are able to read my browser history even when I have ABP with "Fanboy's Social Blocking List" and a selective JS blocker installed.

2- They read my whatsapp messages.