Using the Facebook Messenger app on an iPhone 7 or X, when you click on your profile image > secret conversations, there is a "device last seen" date. What does this secret conversations / device last seen date indicate? Good answers to this are scrubbed from all of the web, it seems. The only answers posted on the web that I have seen are canned replies that are too general, seem to be posted by bots or incomplete. Thanks.
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