What does “first seen on this device” in secret chat means? | Tech Support Guy
iOS, Android get encrypted Secret Conversations on Facebook Messenger | Kaspersky official blog
A Guide on How to Use Facebook Secret Conversations
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Alec Muffett on Twitter: "...and you can review how many devices that you, and the other party, have got in the chat, by looking at the keys menu: https://t.co/KrhZkEFv3l" / Twitter
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