It's always easier to throw petrol on an existing fire than to light one.
In this world you can get people censored for slandering beef, or for supporting the outcome of a Supreme Court case. Then pay people to sing your message over and over again in as many different voices as can be recruited. Done.
edit: I left out "offer your most effective enemies no-show jobs, and if they turn them down, accuse them of being pedophiles."
I'm unaware of any mass censoring apparatus that exists outside of authoritarian countries, such as China or North Korea.
Ideologies are not invented unless you're a caveman. We all got to know the world by listening to others.
The subject of discussion is if and when external forces can alter those ideologies at will. And I have not seen any evidence to support the feasibility of that at scale.
Yes, online content is incredibly influential, but it's not like you can just choose which content is effective.
The effectiveness is tied to a zeitgeist that is not predictable, as far as I have seen.