Facebooks role?
Susanne Oberhauser-Hirschoff

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 :

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.