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TheUnmarkedMan is a Twitter account created by Treyarch. The account was seen interacting with Jaxiplanet, another account ran by Treyarch. Both of them gave teasers for Call of Duty: Black Ops III.
The account returns again within the safehouse's Data Vault. To access TheUnmarkedMan's messages, players have to go to the "Coalescence corporation Disaster" page and press on "Speculation".