Hi, Raphael,
Thank you for reaching out to us here on the PureCloud Community! I found your query fascinating and I wanted to learn a bit more on what we were doing to integrate with more social channels. I can confirm that Facebook Messenger is on the roadmap already! So, look for more information on that in the future. As far as your question around WhatsApp, this is quite new and we're still looking to see what we can do in the future here.
Thanks,
Ashley