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GrapheneOS has 3 main official chat platforms alongside the forum. You should consider to go along with the longer and more formal nature of the forum. Each of the chat platforms is bridged so you can choose you preferred platform:
Matrix requires you to choose a client and server, since it's a federated protocol comparable to email. Matrix is overall the most private option but it has major usability drawbacks including being fairly slow. Our main 2 Matrix rooms were recently bricked by Matrix bugs in the state resolution protocol which is why they're so small compared to the more niche rooms. The main room had over 15k people before getting bricked in November 2022 and over 13k before getting bricked again last month. This is why we added Discord as an option 12 days ago and overhauled the Telegram experience by merging it into a single group with Topics resembling a more primitive Discord experience. We previously weren't linking to Telegram on our site to encourage using Matrix over it but we've stopped trying to focus only on Matrix and we expect both Discord and Telegram to grow faster long term.