@inproceedings{wang-etal-2025-posts,
    title = "From Posts to Timelines: Modeling Mental Health Dynamics from Social Media Timelines with Hybrid {LLM}s",
    author = "Wang, Zimu  and
      Na, Hongbin  and
      Gao, Rena  and
      Ma, Jiayuan  and
      Hua, Yining  and
      Chen, Ling  and
      Wang, Wei",
    editor = "Zirikly, Ayah  and
      Yates, Andrew  and
      Desmet, Bart  and
      Ireland, Molly  and
      Bedrick, Steven  and
      MacAvaney, Sean  and
      Bar, Kfir  and
      Ophir, Yaakov",
    booktitle = "Proceedings of the 10th Workshop on Computational Linguistics and Clinical Psychology (CLPsych 2025)",
    month = may,
    year = "2025",
    address = "Albuquerque, New Mexico",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/2025.clpsych-1.21/",
    pages = "249--255",
    ISBN = "979-8-89176-226-8",
    abstract = "Social media data is recognized for its usefulness in the early detection of mental disorders; however, there is a lack of research focused on modeling individuals' longitudinal mental health dynamics. Moreover, fine-tuning large language models (LLMs) on large-scale, annotated datasets presents challenges due to privacy concerns and the difficulties on data collection and annotation. In this paper, we propose a novel approach for modeling mental health dynamics using hybrid LLMs, where we first apply both classification-based and generation-based models to identify adaptive and maladaptive evidence from individual posts. This evidence is then used to predict well-being scores and generate post-level and timeline-level summaries. Experimental results on the CLPsych 2025 shared task demonstrate the effectiveness of our method, with the generative-based model showing a marked advantage in evidence identification."
}