In my downloaded Facebook log, in the log in list, there is one line that says:

Session updated
Friday, April 21, 2017 at 12:42pm UTC+01

The Browser part is blank, how can that be? Is there any explanation for it?


It could be any number of things. It's obviously relying on parsing the browser data from the User-Agent string header that the browser sends. Maybe the algorithm to parse that data failed. Maybe the browser failed to send it properly. Maybe it wasn't a browser at all, but a third-party application that you've given permission to log into your Facebook account.

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