1. So they're working to help people avoid becoming extremists? 2. 9 years ago they tested if they were affecting people's emotions 3. Like every communications tool, people use it badly 4. There's a button to stop 3rd party tracking

Blaming Facebook for your problems is hiding from your problems. If people are too stupid to avoid becoming extremists, why is that Facebook's fault, that's our fault as society for failing to educate them.

Maybe they should unencrypt WhatsApp so they can find the extremists more easily