Factions Within, Uncertain Across: Within-Document Reader Sub-Groups in Social Highlighting
When many people highlight the same document, is the crowd a single consensus, or is it internally structured into reader sub-groups that mark different things -- and is that structure a stable property of a reader or of the document? Building on prior work showing an individual's within-document highlighting signal is a whisper while individuality lives in selection, we ask the group-level question on a co-readership platform using a margin-preserving curveball null. Experiment 1: within a document, readers form strong sub-groups -- pairs agree far beyond what shared salience, mark density, and sentence popularity predict (nearest-neighbour agreement z=+6.3, significant in 88% of documen...
| Authors | Kazuki Nakayashiki, Keisuke Watanabe |
|---|---|
| Primary category | cs.IR |
| Published | 10 June 2026 |
| Last updated at source | 10 June 2026 |
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