I disagree. If you use WhatsApp, Facebook knows more personal things about you than google. Things you only talk about to your best friend, fights you have with

I disagree. If you use WhatsApp, Facebook knows more personal things about you than google. Things you only talk about to your best friend, fights you have with your significant other, how you behave in group chats etc - it can derive your emotional state and use that. Facebook conducted studies on (real) users on how different posts and the order of posts affects them emotionally. I don't trust services which try to exploit my emotional well-being in order to be more engaging/addictive.