The issue nowadays though is that on social media, there is no sunlight. People are able to post whatever they want anonymously, which means without any accountability either to their views or to their wider reputation in society. That's if they aren't bots, who have no reputation to worry about in the first place.
And we know that there are plenty of bots who are specifically programmed to sow divides in society. Russian bots (and it's hard to imagine the west aren't doing the same) have been discovered posting both far left and far right stuff. And people act like 'if you have good enough arguments, then you won't need to worry about it.' But let's be honest, we all know that's not how beliefs and values work in reality, otherwise no-one would believe in a magic man who came back from crucifiction (sorry Christians). Beliefs and values are primarily socially made, hence why before social media (and still now for the most part) people tend to believe similar things to the people they are geographically closest to. It's why even the rightest wing of people in the UK would be considered an absolute nutjob for suggesting we get rid of the NHS, but a left-wing person would be labelled Mao himself for suggesting that the government should deliver all the healthcare in America. It's got nothing to do with the relative merits of both arguments, and everything to do with socialisation. And that's why being able to express views without any social consequences can be both a great thing and an awful thing. It convinces people that their racist views are widespread, particularly when combined with the algorithm that surrounds you exclusively with people who agree with you, to the point that they begin expressing them in real life and find themselves fired, or recently in the UK, in prison. It also means that people are free to discuss things that would never fly in the community they grew up in, like the atheist in a Mormon town, or the gay person in a conservative Muslim family, or someone living under an authoritarian regime. But what it doesn't offer is a chance to honestly debate the issues out in the open. Hell, its main feature is the fact that it does the opposite of that. It's social media's main strength, but also its biggest threat, if you accept that a modicum of social cohesion is necessary for society to function.