In my downloaded Facebook log, in the log in list, there is one line that says:
Friday, April 21, 2017 at 12:42pm UTC+01
The Browser part is blank, how can that be? Is there any explanation for it?
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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.