We know the mapping between your user id used to generate your community NFT and the social media username that you use to enter the community. However, we delete this information immediately after you claim your NFT, so if you lose access to your community NFT, you will have to repeat the process again.
Link to the repo.
No, the chats cannot be read by us or anyone who doesn't belong to the community
Nothing. Any information we know is publicly accessible on the Ethereum blockchain.