I mentioned that this happened on Conservative sites, and it was during the Primaries. It seems unlikely that, under those circumstances, people would be so shy about expressing their preferences.

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.