Facebooks role?
Susanne Oberhauser-Hirschoff
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Susanne’s comment is bang on.

For a non-video overview, Vice reports on the man who warned against the perils of data-driven manipulation — and found his study being (mis)used in exactly the way he feared :
https://motherboard.vice.com/en_us/article/how-our-likes-helped-trump-win

One example: black voters were shown Trump ads on Facebook quoting Hillary Clinton comments about black “super-predators”. This helps explain why 8% of black votes went to Trump — among them 13% of young black voters.