I absolutely agree that online spaces are an excellent way to educate and radicalize. Agitprop is extremely useful, in fact I support trying to move people from corporate media to federated, FOSS media as we can't be as easily censored here. I don't think skills like critical thinking can be taught online without the person already trying to develop such skills, but agitprop helps them reconsider if they need to research more.

As for the fediverse, I think the big 3 positions are anarchism, liberalism, and Marxism-Leninism, at least on Lemmy. Some people sit on the outskirts of those, but ML has a supermajority among Marxists here, as an example. I think it's best therefore to be upfront and not try to cage my views, obscure them, etc, but to try to meet people where they are at and gently push them to where they can learn more if they so choose. That's the best way I can think of.