In my opinion this became a problem when Facebook/Twitter/Youtube decided to try to create a "top stories" type of algorithmic content selection, in an attempt to try to increase engagement. What happens when they put that white nationalist content in the top stories, because their uncontrolled algorithms have decided you might be interested in that type of content?
In my opinion it should go back to the old days of chronological content from only the entities I've decided to listen to. (I.E. followed/friends/subscribed.) That way, if the WN want to push their mess, they can, and I'll never be exposed to it because I'm not at all interested in following someone who would ever share that.
If I'm researching a topic about them, then I can search using a standard searching algorithm, and find the relevant content.
Maybe a naive point of view in today's age, but that's what I think is simplest. It also just happens to be how it used to be.