The archive · Product Ideas · Product decision · 2021–2022
Radiopaper keeps public comments unpublished until the person they address accepts them
Four bootstrapped builders made a social network where a message only goes public once the addressee replies — 346 HN points.
Radiopaper
What it had to solve
A bootstrapped team of four (evnp, daave, davidschaengold and youngnh) spent about 16 months building Radiopaper alongside full-time, part-time and consulting jobs. Their brief was to design a public conversation space whose mechanics themselves resist trolling and abuse.
How it works
Public comment boxes give everyone a microphone: an anonymous stranger can derail, harass or flood any conversation, and platform countermeasures like downvotes, blocking and moderation create an arms race. Radiopaper's answer was to change the publication rule itself rather than add more policing.
In Radiopaper every thread is a one-on-one exchange. A message reaches its recipient privately and only appears publicly when that person replies or accepts it — so no hostile message can ever reach an audience without its target's consent. Once a two-sided conversation exists, neither party can block the other or unpublish it, though each can edit or delete their own posts.
A second mechanic handles endings: continued messages that are ignored count as 'post-scripts', which do not push a conversation back to the top of the feed. One person can therefore stop a thread by silence, without censorship or an edit war. The team frames the whole design as 'social skeuomorphism' — model online conversation on the safeguards of a real-world party, where acknowledging someone but leaving the conversation is normal and public.
The Show HN on 2022-04-29 drew 346 points and 323 comments. Reviewers praised the simplicity of the rule, linked it to older systems like Gawker/Kinja's gray comments, and spent much of the thread debating real risks — echo chambers, sock puppets and the censorship power each participant now holds.
Why it lands
- Gating publication on the addressee attacks trolling at the moment it happens: a hostile message can never reach an audience unless its target lets it.
- Social skeuomorphism gave the team a testable design principle: copy the safeguards of real-world events like parties instead of inventing abstract moderation rules.
- Making email a full interaction channel invites people who avoid social networks to hold public conversations with tools they already own.
- De-ranking ignored follow-ups as silent post-scripts lets anyone end a conversation without deleting anything — the reply exists, it just stops being promoted.
What it did
The Show HN on 2022-04-29 drew 346 points and 323 comments. Commenters called the core rule 'simple and elegant', compared it to Gawker/Kinja's gray comments and letters to the editor, and spent hundreds of messages stress-testing echo-chamber, sock-puppet and censorship risks, with founders answering throughout the thread.
What you can take
To change how a community behaves, change the mechanics that shape it: conditional publication makes an addressee's silence a quiet, non-destructive way to end a conversation.
Since then
The launch thread doubled as a roadmap: the founders acknowledged missing search, topics and reactions, said they had removed an earlier reaction set for simplicity, and put account blocking plus policy enforcement on the short-term list. Some commenters signed up and started conversations on the platform mid-thread, and the founders answered repeated objections that requiring acceptance hands each participant censorship power — arguing that readers understand the mechanic and discount one-sided threads accordingly.
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