I guarantee you that no one in Facebook feels comfortable suggesting that they investigate another possible (not likely, but possible) cause: the code is just w

I guarantee you that no one in Facebook feels comfortable suggesting that they investigate another possible (not likely, but possible) cause: the code is just worse, on average. And there could be many reasons for that, beyond just the simplistic "girls are bad at code." Maybe Facebook has a lower bar for hiring female engineers due to affirmative action.