I don't think follow bots are a good idea, because they make the federated timeline the same on every node. Without them, the federated timeline is still an expression of the interests of the node's users.
The Ambassador idea is an interesting variation on this theme.

https://a.weirder.earth/users/mykola/updates/309

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@clacke it's interesting, but retweeting 'most popular' stuff around the network is exactly the kind of algorithmic mood making that I had hoped we'd left behind on twitter.
@lambadalambda I don't know. Depends on how you do it, and the scale of the instances. For a small and new instance, I think an ambassador bot that presents a "best of" of the instance adds something useful to the mix.

The idea that bots don't pollute the public and federated timelines is a good one.
@clacke I guess I just don't have much faith in 'best of'.
@lambadalambda @clacke when I see such categories in the silos they're always the kinds of things I want to avoid. That's because of their monolithic structure.
@bob @lambadalambda I think smaller instances with their own narrow selection makes the difference. I'm orders of magnitued more interested in "trending on heldscalla" than "trending on twitter". Because that basically means both @dtluna and @lambadalambda liked something.