serve reminder anyone think facebook place honest open discussions political social issue tow liberal line prepare punish white live matter imply live matter black live matter movement shed light racial profile police brutality racial inequality experience african-american community across america apparently employees facebook notoriously white bro-centric menlo park california office agree.in private memo post company announcement page employees mark zuckerberg acknowledge employees scratch black live matter sic write live matter company famous signature wall company whose staff percent black face issue head never rule around people write wall say zuckerberg post expect everybody treat respect entire message obtain gizmodo post full via gizmodo facebook ceo threaten employees express view oppose stop replace black live matter