FB is not Uber, where brothership rules does not apply. If you think like you may have an edge on calibrations because the manager is your bro, that's only happens in Uber. FB calibrations are totally based on objective criterias. If that's your expectations, don't move to FB.
I'm failing to see why you brought up Facebook as a company. The dude was asking whether it's okay to have the manager as a friend _on_ Facebook, not _at_ Facebook.
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But at Uber... Anything and everything can be used against you when things go south.