There's a second bite of the cherry for bots/trolls/shills on social media.
For clarity, in case it needs saying, this is about accounts which receive tasking from another party; not "people who disagree with me".
The art of the fake poster on any social media site is to collect real posters in their wake, bond with them socially or hope the real posters pick up their narratives and run with them. The latter was described in the Justin Baldoni PR firm messages, and there are examples of the former in the SouthLoneStar and TEN_GOP trolls, which were an accounts run from a St Petersburg troll farm.
https://www.theguardian.com/uk-news/2017/nov/14/how-a-russian-troll-soldier-stirred-anger-after-the-westminster-attack
“We had to write ‘ordinary posts’, about making cakes or music tracks we liked, but then every now and then throw in a political post”
And:
https://www.bbc.co.uk/news/technology-41982569
Any attempt to (correctly!) call out the shill usually has bycatch of perfectly genuine posters who either feel that their "friend" is being wrongly accused, or who end up being accused of not being genuine themselves because they're repeating the shill's material.
Perfectly genuine posters are (correctly!) indignant and protest that they are not shills. Genuine posters feel that because they themselves are genuine, shill must be too; genuine posters defend shill and accuse accusers.
Shill happy as larry, sits back and enjoys the merry-go-round.
A particularly nasty consequence of this type of influencing is that all of us, when sincerely engaged in good and worthy causes, will probably at some point experience befriending by tasked accounts. It's not a nice thought.
Sometimes the taskmaster cares about the direction in which they're nudging people; sometimes it's "I don't care who wins, but I'll pay to watch," because the whole thing is so horribly corrosive to trust.
I really don't know what we can do about it – I suppose other than accept that it's going to happen every now and then, and just be emotionally prepared for that. Just as we have to be for the emotional trolls who lie about bereavement, etc.