Also these are not just stand-alone fake accounts with no friends created for making comments....these are curated to have enough details that make them look plausible to an unsophisticated automated detector (or overworked FB abuse department employee), but they have few friends, all with similar sorts of profiles, and no signs of activity except for posting comments.
I do agree that there was an element of "shyness" and self-censorship, but I expect it was from supporters of other candidates, who would not want their Real Names and identities to get embroiled in fights with fake profiles.
As a side note, I don't have a FB account so I don't know how this works but do your friends have the ability to see what comments you've made on sites using FB login for commenting?
That said, I'm sure that all the politicians have people who can drum up social media followers or spread whatever message they want. I don't think there's any conspiracy to it. It's not like we've gotten rid of email spam, either. This is just an extension of that.
Perhaps there are commenters unwilling to link their real FB identity to supporting Trump? On the other hand, I see plenty of people make outrageous statements online clearly linked to their real FB profile so maybe this isn't a widespread concern.