Alt-Right Pipeline
Used to describe the internet "pipeline" that slowly radicalizes typically young, white men into the ideology of the far/alt-right. It takes advantage of a process of desensitization through the YouTube recommendation algorithm. Slowly showing the viewer more and more radical content without themselves noticing much of a change.
One minute I was watching Pewdiepie and the next I was chanting Sieg Heil at the Richard Spencer rally. That Alt-Right Pipeline is no joke.