A variant account to echo remarks to drive engagement & make people think more people think in the manner of the engagements than actually do.
For example - if you had a bot farm, with 5000 variant identities, all tied to variant emails, & a simple algorithm.... One could get it to seem like 5K people all agree on whatever. Then, mob mentality happens & suddenly easily impressionable people all are believing & responding accordingly on whatever issue or topic.
Suddenly - it's no longer ok to say this or do that, because a bot farm ran by one smart person capable of creating and maintaining a bot farm said so basically.