The perils of peer bubbles: How early newcomer communication network composition shapes organizational integration and early turnover.

Investigating early turnover among organizational newcomers, our study reveals how excessive communications with fellow newcomers during initial entry significantly increase departure risk. Through analyzing daily behavioral data of communications between 8,043 newcomers and nearly 20,000 existing employees in a high-tech firm, we demonstrate that when newcomers spend a disproportionate amount of their early communications with cohort newcomers rather than established employees, they face elevated turnover risk. By integrating first impression research with network theory, we show how these early communication patterns trigger self-reinforcing dynamics that shape newcomers' structural position within the organization. We introduce the concept of "core embeddedness" to explain how initial network choices affect turnover decisions, finding that the critical window for effective socialization is considerably shorter than previously understood-with the first 10 days being particularly decisive. Supplementary analyses reveal that interunit newcomer communications are especially problematic for core embeddedness and subsequent turnover. These insights challenge conventional assumptions about cohort-based socialization, demonstrating how seemingly supportive peer communications can paradoxically constrain organizational integration through homophily effects, with important implications for contemporary workforce retention. (PsycInfo Database Record (c) 2026 APA, all rights reserved).