There was a time, not so long ago, when Twitter felt like the closest thing we had to a genuine digital public square. Politicians, journalists, activists, and everyday Australians all mingled in the same space, arguing, joking, and occasionally finding common ground. It wasn’t perfect—far from it—but it was ours.

That version of Twitter is gone now. What’s left is something harder to define and even harder to defend.

The platform’s decline wasn’t sudden. It happened in stages, like watching a city slowly empty out. First, the blue tick verification system became a farce, turning credibility into a commodity anyone could buy. Then came the mass firings and erratic policy changes that made the whole operation feel like it was being run from a billionaire’s group chat at 3am. Trust evaporated faster than you could say “community notes.”

But the real death blow wasn’t technical—it was cultural. Twitter stopped being a place where diverse voices collided and started becoming a collection of walled gardens. Left-wing Twitter, right-wing Twitter, crypto Twitter, journalist Twitter—they all exist, but they barely speak to each other anymore. The algorithm doesn’t want them to. Engagement is optimised for outrage, not understanding.

I remember when breaking news on Twitter felt electric. The Arab Spring. Black Lives Matter. Even just live-tweeting the footy. There was this sense that everyone was watching the same thing unfold together, even if we disagreed about what it meant. Now? Half the people aren’t even on the platform anymore, and the other half are too busy fighting about whether it should be called “X” to notice.

The Australian media landscape feels this loss acutely. For years, Twitter was where journalists tested ideas, found sources, and gauged public sentiment. It was messy, but it worked. Now, many have fled to Bluesky or Threads or just retreated to email newsletters. The public square has been replaced by private courtyards.

What’s fascinating is that the death of Twitter as a public square hasn’t killed the need for one. If anything, it’s made that need more obvious. We’re more politically fractured than ever. Trust in institutions is at historic lows. The algorithms that were supposed to connect us have instead sorted us into ever-smaller tribes. And yet, we keep searching for spaces where genuine public discourse can happen.

Some argue that the public square was always a myth. Twitter was never truly democratic—it amplified certain voices over others, often the loudest or wealthiest. The “public” in public square was more aspirational than actual. There’s truth to that. But the aspiration mattered. The belief that we could all gather in one digital space and hash things out, however imperfectly, was itself valuable.

The platforms trying to replace Twitter haven’t cracked the code yet. Bluesky is too insular. Threads is too sterile. Mastodon is too complicated. Each one replicates some aspect of what Twitter used to be, but none of them have captured the whole chaotic energy that made it work. Maybe that’s impossible now. Maybe the moment has passed.

I don’t think we can go back to 2014 Twitter, even if we wanted to. The internet has changed. We’ve changed. The idea that millions of strangers can coexist in one digital space without it turning toxic feels increasingly naive. But I also don’t think the answer is to give up on the concept of a public square entirely.

What we need are better rules, better moderation, and—crucially—better business models. The ad-driven engagement economy is fundamentally incompatible with healthy discourse. It rewards polarisation and punishes nuance. Until that changes, any platform attempting to be a public square will face the same gravitational pull toward chaos.

The fall of Twitter as a public square is more than just a tech story. It’s a parable about what happens when we let private companies mediate public life without accountability. It’s a warning about the fragility of digital spaces that feel permanent but can be reshaped by one person’s whims. And it’s a challenge: if not Twitter, then what?

I don’t have the answer. But I do know that public discourse matters, and we can’t afford to outsource it entirely to algorithms and billionaires. The town square might be digital now, but it still needs to belong to the public.

The question is whether we’ll build one that lasts, or just keep wandering from platform to platform, hoping the next one will be different.