It's important to note however that alt-right content is just one particular example. Often people encounter this algorithmic behavior and ascribe certain motiv

It's important to note however that alt-right content is just one particular example. Often people encounter this algorithmic behavior and ascribe certain motives to Youtube etc. And while that probably IS happening to some degree, it's also true, and probably more common, that the system is just showing you more of what it thinks you will like. There are plenty of stories of this happening in a more innocuous (but still obnoxious) way: click one car repair video, everything is car repair videos. Click one clip from an old animated show for nostalgia, EVERYTHING is now clips from old 90s shows. And to counter all this, often the system is actually surprisingly insightful in digging up obscure crap from god knows where that's really neat, and right up your alley, that you never would have seen otherwise. And then it goes back to filling your whole front page with Simpsons clips.