Use Chat
If you want to help your customers using live chat, you can use the Chat for Dynamics 365 Customer Service channel.
Use the Facebook channel.
Note: Social channels
If you want to help your customers using social media, you can use the following social channels:
Apple Messages for Business
Facebook
Google's Business Messages
WhatsApp through Twilio
Twitter
WeChat
LINE
Reference:
https://docs.microsoft.com/en-us/dynamics365/customer-service/channels
https://docs.microsoft.com/en-us/dynamics365/customer-service/facebook