This article explores the Internet’s often touted potential for facilitating reconciliation. It conceptualises Wikipedia as a site for collective memory construction and analyses the Chinese- and Japanese-language entries on the bilaterally contentious Second Sino-Japanese War. It addresses the question of how to make sense of the construction of these online collective memory narratives theoretically. Both historical determinism and instrumentalism – two influential theoretical approaches to collective memory and reconciliation – have great difficulties in fully accounting for this case. Instead, it is argued that ontological security theory is better equipped for understanding collective memory construction in Wikipedia. It is suggested that ontological security seeking can impede efforts for reconciliation even when, as in Wikipedia, there exist norms seeking to promote more neutral narratives. It is argued that a subtle bias in favour of the in-group and against the out-group functions as a mechanism for ontological security management that protects a positive self-identity.