According to the Oculus blog, chatting with Messenger friends via the headset does not affect Oculus privacy settings. You can still use Oculus Chats to send messages to friends with your Oculus username. Facebook revealed in the fall that it would bring Messenger to Oculus, not long after announcing that all Oculus headsets will require a Facebook account to be used.
The software update v25, which is being rolled out gradually, also features a feature called App Lab. This will give developers a way to distribute their apps and games outside the Oculus Store without users having to download them. Facebook suggests that this will allow maintaining a high level of quality within the store, while offering developers a safe way to share creations that may be more refined or experimental.
Although these apps may not be in the Oculus Store, you can still search for them if you know the exact name and they will appear in the App Lab section of the results. Developers can also share their applications with a URL. Any App Lab games or applications you purchase will be added to Quest’s library and will receive automatic updates.