The ads are a red herring (and uncomfortably visible for both parties).
The real activity was on Facebook groups, viralizing anti-immigration and far-left news, controling the narritive on 4chan pol and /r/the_donald, and botted up - and downvote brigades.
It was so blatant it was visible to a non-expert on information warfare like me.
The people doing this probably got paid about as much as a paid advertisement.