alt Hacker NewsI'm pretty sure that societies have had social pressure for not interacting with people who society frowns upon as long as there have been societies. If anything, the "affairs of the state" that handle a lot of this nowadays developed because of the social pressure, not the other way around. Social media didn't somehow invent the idea of societies shunning people that are not deemed acceptable, although it did probably make it more visible.
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I think that the argument is that social media amplified the effect. It obviously didn't create social pressure, but pressure was limited, and people were just free to be more diverse--or, to put it in the opposite way, there was less pressure to conform.
When something bad happens (like, say, a murder), people want to talk about it. But now, the conversations happen in view of the public--the _whole_ public. So people don't want to be on the wrong side of the conversation. In private, among friends they understand and trust, they might express doubt or complex thoughts. But out in the general public, where their opinion could be boiled down to a soundbite, they don't dare lean on nuance. So, they play it safe.
Go onto Reddit, and under some controversial story post a nuanced take. Chances are you'll get downvoted to oblivion. And that's fine--it's pseudonymous. But if it were attached to your real name, and you happened to be wrong (or some part of your statement could be taken out of context and made to look wrong), then it could always be dredged up and used against you. OTOH, there's basically no scenario where it would be dredged up to help you.
So the result is, all nuance is drained out of the conversation. We end up with junk food for public discourse: no fiber, no nutrition, just feel-good sugar: "fuck that guy, he should be locked up for life!" And seeing everybody carry that line unanimously makes anybody who doesn't look immediately suspicious.
Yes, everything that we experience today is reflected in social patterns that wax and wane and exist in parallel throughout history and across the world. Humans and their group behavior are all just a constant whirl of remixes.
But what you embrace as historical and perennial in shunning, shame, and ostracism is in like historical and perennial company with compassion, forgiveness, mercy, etc.
But for many of us in the US, in the GenX and Millenial generations that we grew up in, we experienced the worst of the shunning culture in high school, among small town cliques, and in the midst of certain church groups; and then social media came, and we witnessed a clear turn where the dreaded "Mean Girl" dynamics that we hoped to have escaped in a liberalizing adult world of funky tattooed weirdos, long haired UNIX nerds, rainbow-flagging Unitarians somehow became the dominant voice of social media culture and it was somehow being championed loudest of all by some of those same colorful weirdos!
Maybe you're happy with that turn, but you can't really take away the disappointing and disorienting transition that many of us experienced as it took hold.