A person I know has gone missing, and the last bit of information about him is a Facebook post that he posted 3 days after any of his relatives have heard of him. It has been more than 15 days since he has gone missing, and his relatives came up with the idea to inspect his activity logs with the hope to locate where he was, and whether he has logged in on Facebook again.
Now, this sounded like a scenario that has happened before, and I googled for some information. It turns out that only a law enforcement officer can request such activity logs: https://www.facebook.com/help/174766325911479?ref=u2u. I would want to know if there is anything else that could help to speed this up.