When the creator of the Kbin fediverse platform vanished under the load of the 2023 Reddit exodus, the biggest Kbin instance forked the project to keep its community alive. Kbin is now effectively dead; Mbin is the only maintained line.
PHP/Symfony application forked from Kbin with federation via ActivityPub, supporting both link aggregation (microblogging, magazines) and following profiles. The Mbin effort added community governance, test coverage, and a much faster release cadence than the original's long-bottlenecked solo development.
Kbin was created in January 2021 by Polish developer Ernest Wiśniewski as a federated link aggregator and microblogging platform - a decentralized Reddit. For two years it was a solo project with a small but enthusiastic community. Then came June 2023: the Reddit API protests drove millions of users to look for alternatives, and Kbin's flagship instance, kbin.social, exploded from a few thousand to more than 40,000 accounts in weeks. The single-developer bottleneck that had been a curiosity became a crisis: issues piled up, pull requests sat unmerged, and the developer was frequently unreachable, eventually explaining that he was dealing with health problems and burnout.
By October 2023 the community's patience was gone. The maintainer of kbin.social, Jerry Bell, forked the project as Mbin, and within days the largest instance - fedia.io - announced it was switching over, briefly announcing a shutdown of its Kbin instance before reversing course to avoid losing its community. The fork was led by Melroy van den Berg, who introduced a community governance model called C4. The original Kbin project had its last activity in late 2024 and its site is now offline; Mbin continues to ship, with version 1.10 released in mid-2026 and multiple instances federating actively.
First lines of the Kbin codebase are written.
Reddit API protests drive tens of thousands of new users to kbin.social.
The Mbin fork is created.
fedia.io, the largest Kbin instance, announces a switch to Mbin.
The original kbin-core repository sees its last activity.
Mbin releases v1.10.0 with an active federation.
“Single-developer bottlenecks were a feature until the Reddit exodus made them a catastrophe.”
“The community needed a project it could actually contribute to.”
“We are forking Kbin to keep our community alive.”
Mbin kept the Kbin fediverse alive and gave it a governance model the original never had. The fork is now the reference implementation of the 'fediverse Reddit' idea, and its C4 governance process has become the standard argument for why federation needs community ownership.