Supplementary file 1_After the lights go out: announcement-phase public relational expression and later continuity-oriented responses to an AI agent shutdown in an account-linked longitudinal study of Weibo posts.docx

Migration was no longer significant. A separate account-equal fractional logit analysis with HC3 robust standard errors produced positive associations for record preservation (OR = 1.458, p = 0.006), persona reconstruction (OR = 1.281, p = 0.010), functional substitution (OR = 1.383, p = 0.003), and service-preservation advocacy (OR = 1.149, p = 0.012); all four survived correction for six comparisons (q = 0.018). Migration (OR = 1.056, p = 0.407, q = 0.489) and continued use (OR = 1.020, p = 0.843, q = 0.843) were not significant.

When the corresponding announcement-phase outcome was included, the same four categories remained significant (q = 0.013, 0.013, 0.013, and 0.031, respectively). Paired-phase comparisons showed lower mean broad adaptation (0.594 versus 0.669) and restricted pooled continuity expression (0.201 versus 0.272) after shutdown, although median within-account changes were zero and the continuity sign test was non-significant (p = 0.219).

Among active public participants, announcement-phase relational language was associated most consistently with later record-preservation and persona-reconstruction discourse.</p>