Saw more Lumias then iPhones when I lived in Chile last year, I wouldn't be surprised if that's also the case in Brazil.
Really liking the new Facebook beta, my only gripes are that settings are hidden in the last tab rather than as an AppBar menu item, and that the "pivot" isn't a true pivot (you can't go from first to last or vice-versa). I know this is so the right panel can work, but still.
Also, now that Messenger communicates with Facebook, it'd be nice if Facebook could communicate with Messenger (not showing messages in the Facebook app if you have Messenger and opening Messenger from tapping the Messages button in the Facebook app).
Great update overall though.