Google's Onebox revamp cuts repeat CSAM searches by 3.8%

A team of researchers from Google, universities, and child protection organizations published a study on arXiv (cs.HC/2606.06126) evaluating a strategic shift in Google Search's 'Onebox' feature for queries related to child sexual abuse material (CSAM). The original Onebox focused on reporting mechanisms; the revised version instead highlights legal repercussions and directs users to therapeutic resources. Using a difference-in-differences analysis of internal Google Search logs, the team found that the new messaging led to a 3.8 percentage point reduction in subsequent CSAM-related queries within the same search session compared to the baseline.

The study also measured engagement with help-providing resources: the average click-through rate on any hyperlinked button was 0.73%. While modest, the authors argue that even small click-through rates represent meaningful diversion when scaled across billions of searches. The research presents convergent evidence that a subset of individuals searching for CSAM can be deterred from continued seeking and instead access therapeutic services. The paper was submitted on June 4, 2026, and includes 14 co-authors from Google, SafeSurfing, Stop It Now!, and academic institutions.