Today, I have recently a lots of mail from Facebook.
These mails are auto-generated by Bugzilla as Facebook has updated the status of the bug reports that I have opened or subscribed too.
Facebook has “closed” many of them or marked them as invalid. Anyway, I don’t care, as personally, I don’t think Facebook will further work on the bug reports in Bugzilla.
So, if you have any bug reports in Bugzilla that you still want Facebook to take a look at it, I would suggest you reporting this again in the bug tool.