ABSTRACT Driven by the increasing use of social media by people seeking to reconstruct family histories and preserve historical, cultural, and societal legacy, genealogy-based online communities are experiencing a surge in popularity. This study explores how trauma-affected communities use online communities to reconstruct their identities and histories, demonstrating the resilience and adaptability of these groups in the digital age. Based on the theory of Knowledge Co-Creation, this paper presents a novel conceptual framework designed to categorize the content in such communities. This framework is composed of two axes. The first axis, ‘Time,’ reflects the evolving character of participants’ involvement, starting with an exploration of immediate family history and gradually expanding to encompass a broader interest in ancestral and communal history of the past. The second axis, ‘Space,’ explores the interplay between online interactions and offline activities. To demonstrate the applicability of this framework, the paper focuses on the case study of the WhatsApp community dedicated to collaborative research of the descendants of annihilated Jewish communities of the Upper Silesia region of southwestern Poland.This research contributes to the literature on digital genealogy and online communities by offering a structured approach to analyzing the dynamics of trauma-affected populations engaging in collaborative genealogical research.