I think there are two questions in this. 1. Does youtube encourage extreme positions? I think Youtube, as well as many other social media platforms do encourage people to go to the extremes of their beliefs by eventually promoting any lunatic on the fringe to your inbox. This might sound strange but I think having choice promotes a more hardline position, because people will mostly tend to choose videos that are reflecting their own views. Back in the day on the TV pre-2000 when we only had 5 channels we were forced to watch things we wouldn't normally have chosen because there was nothing else on tv. I used to watch the tv show Desmonds, which is a comedy, I think on channel 4, about an afro-caribbean barber shop. I recently noticed the series being played on one of the channels we get on Sky, called BET (Black Entertainment Television). So now for the majority of non-black people these days will never see that show. 2. Does youtube favour the far-right? I think this comes down to which side of the left/right paradigm is using the platform properly. Most of the left wing people I see are more reactionary. So they protest more and tend not to be interested in talking to people they deem as 'alt-right nazis', so they are more likely to end up in an echo-chamber. But also they tend to watch the right-wing videos to critique them. Where-as on the right, they will talk about issues but also make suggestions to change things. They also try to interview people on the left too. A good example of this is Steven Crowder who has his 'Change My Mind' series, were he talks to people specifically opposed to his views. Where is the similar thing on the left side? So it's obvious people are going to tune in more to the right leaning videos because they are the ones setting the pace. Btw, before people point out specific examples of where a left-wing person does interview people, I know a few too (and I subscribe to them). But they are in a severe minority on the left. If the left wants to be equally as favoured then they need to stop being reactionary and start producing their own ideas and interviewing their ideologically opponents instead of supporting stupid ideas like 'punch a nazi'.