Researchers analyze four major Reddit community bans from 2015-2020 and their effects on six generalist Voat communities, investigating how deplatformed users who migrated shaped community structure and toxicity. The approach combines network analysis of user-community bipartite graphs, time-resolved cohort tracking, a ToxiGen classifier to estimate toxicity probabilities, breakpoint analyses on E-I (external-internal) community indices, and dynamic reputation modeling to trace activity, centrality, and persistence across cohorts.
Findings show distinct trajectories in cohort mixing, structural representation, toxicity, and repeat participation. Breakpoint analysis highlights a clear shift during the GreatAwakening period in the E-I index, while mean ToxiGen probability rose from about 0.12 in late 2015 to above 0.24 by mid-2018 and remained elevated. Fixed-cohort models show high-activity arrivals were more likely to become structurally central, and survival analyses indicate longer persistence among early cohorts with higher toxicity. Overall, deplatforming coincided with measurable changes on the receiving platform - higher aggregate toxicity, altered inter-community mixing, and concentration of influence among energetic arrivals - underscoring downstream consequences of moderation decisions and the need to monitor receiving communities.
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