When Elon Musk completed his acquisition of Twitter in October 2022 and renamed it X the following year, waves of users moved to alternatives — Bluesky and Mastodon chief among them — in numbers large enough that both platforms' signup systems visibly struggled to keep up at points. Leaving no longer meant leaving public conversation altogether, in a way it effectively did even a few years earlier.
The mechanism driving that migration is real: dissatisfaction with moderation decisions, algorithmic changes, and data practices pushed users and communities toward smaller, more legible spaces where the rules are clearer and the operator — Bluesky PBC on one side, thousands of independent Mastodon server admins on the other — is more accountable, or at least closer.
What gets lost in the move is not trivial. A single dominant town square, whatever its flaws, gave disparate groups a shared, if imperfect, sense of what was being discussed and by whom. Splitting that into a dozen smaller squares, each with its own norms and membership, makes that shared reference point harder to maintain and easier to lose without anyone noticing.
The people most affected are not the technically fluent early adopters who move comfortably between platforms and protocols. It is everyone else, for whom the cost of following a conversation across several different apps is high enough that they simply stop following, and public discourse quietly narrows to whoever bothered to make the move.
There is a version of decentralization that solves this: interoperable protocols, like the W3C's ActivityPub underneath Mastodon and the AT Protocol underneath Bluesky, that let people stay in touch regardless of which specific platform they choose. Bridges between the two — Bridgy Fed is the best-known attempt — already exist and work, in the sense that a post can technically cross from one network to the other. They are not yet seamless enough that someone unfamiliar with either protocol would trust them by default.
Whether that bridge, or one like it, becomes invisible plumbing that most users never think about — the way nobody thinks about the protocols moving their email — or remains a workaround only enthusiasts bother configuring will decide more about whether a real commons survives than any single platform's user count ever will.