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Facebook: Chat and Messages
Make a thumbs-up and your avatar will smile; thumbs-down, you'll frown.
Also known as instant messaging, this is a popular way to communicate online.
To access your inbox, click the Messages icon, then select See All in Messenger.
Facebook has clearly put a ton of work into the friendly-yet-not-uncanny look of its cartoon avatars.
As far as the app itself, which I tested within Oculus Quest, make no mistake: this is Facebook's version of Rec Room.