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While much of what is posted, shared, or discussed on Facebook and Facebook Messenger is quickly forgotten as the quest for new material leaves little room to absorb and digest content. Facebook began in February of 2004 - twenty-one years ago. A person of thirty barely has a concept of life without Facebook. An adult of forty years has experienced community, neighbors, sharing tangible items such as photos, ideas, hugs, tears, and MEMORIES while they contrast the parameters of Facebook/Messenger and how one loses the slower pace of in-person friendships. Those memories are not dismissed quickly.
You cannot determine how much memory Facebook Messenger is using on your device within Messenger.
Facebook / Meta AI suggested: "If you're still unsure or need more specific help, consider checking Messenger Help Center or your device's support resources for more detailed instructions."
You can download a copy of all your end-to-end encrypted messages at any time if you’ve turned on secure storage in Messenger. Your data in end-to-end encrypted chats can include:
Download your data from Messenger end-to-end encrypted chats | Messenger Help Center
Face and hand effects privacy notice | Messenger Help Center
What happens when Messenger secure storage is off | Messenger Help Center - This feature is gradually being introduced and may not be available to you yet.
Delete messages or chats on Messenger | Messenger Help Center Deleting messages, chats or photos permanently removes them, and you won't be able to see them anymore. If you want to hide a chat from your Chats list but not delete it, you can archive the chat instead.
Turn on secure storage for end-to-end encrypted messages | Messenger Help Center - This feature is gradually being introduced and may not be available to you yet.
Commands on Messenger | Messenger Help Center