Psychologically Potent, Computationally Invisible: LLMs Generate Social-Comparison Triggers They Fail to Detect

This paper introduces XHS-SCoRE, a reader-grounded benchmark for detecting if a text-only Xiaohongshu (RedNote) post elicits upward, downward, or neutral social comparison. The study finds a consistent mismatch between LLM generation fluency and reliable detection ability, indicating that LLMs generate social-comparison triggers they fail to robustly detect.