Messenger supports end-to-end encrypted chats, and more encryption features are rolling out. https://messengernews.fb.com/2023/08/22/expanding-testing-for-end-to-end-encryption-on-messenger/. It's a huge project to implement encryption given the number of features that have to be rewritten (e.g. scraping URLs to show a preview picture now has to be done client-side rather than server-side)
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