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arxiv: 2606.06126 · v2 · pith:JED6MLAPnew · submitted 2026-06-04 · 💻 cs.HC · cs.CY

Deterring Searches for Child Sexual Abuse Material on Google Search and Promoting Help-Seeking

Rebecca Umbach , Griffin Hunt , John Buckley , Joel Scanlan , Caoilte \'O Ciardha , Ethel Quayle , Ainslie Heasman , Maximilian von Heyden
show 6 more authors
Elizabeth Letourneau Donald Findlater Tegan Insoll Richard Wortley Chad Steel Abhishek Roy
This is my paper

Pith reviewed 2026-06-27 23:35 UTC · model grok-4.3

classification 💻 cs.HC cs.CY
keywords CSAMGoogle SearchOneboxdeterrencehelp-seekingchild sexual abuse materialdifference-in-differencesonline intervention
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The pith

Google's revised Onebox messaging on CSAM searches cuts same-session follow-up queries by 3.8 percentage points and draws 0.73 percent clicks to help resources.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper tests whether changing the warning shown at the top of Google Search results for child sexual abuse material queries from a reporting focus to one emphasizing legal repercussions and therapeutic resources can interrupt continued searching and steer users toward support. A difference-in-differences comparison of internal search logs before and after the change finds a measurable drop in related queries within the same session. The study also records a modest rate at which users click through to the linked help resources. If these effects hold, the results indicate that a subset of people conducting such searches can be deterred from persisting and redirected to services that address underlying issues.

Core claim

The revised Onebox intervention, which highlights repercussions and therapeutic resources rather than reporting, produced a 3.8 percentage point reduction relative to the prior version in subsequent CSAM-related queries within the same search session, alongside a 0.73 percent average click-through rate on buttons linking to help-providing resources; the authors interpret this as convergent evidence that some individuals can be deterred from ongoing CSAM-seeking and redirected to therapeutic services.

What carries the argument

The revised Onebox feature that replaces reporting-focused messaging with emphasis on legal repercussions and links to therapeutic resources.

If this is right

  • The messaging shift deters some users from continuing CSAM-related searches in the same session.
  • A measurable fraction of users engage with the provided links to therapeutic resources.
  • Convergent evidence supports that deterrence and redirection are achievable through search-interface changes.
  • The approach demonstrates one concrete way online platforms can respond to harmful search behavior.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar interface interventions could be tested on other search engines or for different categories of prohibited content.
  • Combining the messaging with direct handoffs to therapy providers might increase the observed click-through rate.
  • Longer-term tracking could reveal whether the session-level reduction translates into fewer overall CSAM searches over days or weeks.

Load-bearing premise

The difference-in-differences analysis on internal search logs isolates the causal effect of the messaging change without other platform updates or external events affecting the treatment versus control periods.

What would settle it

A controlled test that randomly assigns the new versus old messaging to matched users and finds no reduction in follow-up CSAM queries would falsify the claimed effect.

Figures

Figures reproduced from arXiv: 2606.06126 by Abhishek Roy, Ainslie Heasman, Caoilte \'O Ciardha, Chad Steel, Donald Findlater, Elizabeth Letourneau, Ethel Quayle, Griffin Hunt, Joel Scanlan, John Buckley, Maximilian von Heyden, Rebecca Umbach, Richard Wortley, Tegan Insoll.

Figure 1
Figure 1. Figure 1: Oneboxes prior to revision. modate bespoke experiences, where UK-based users had a distinct 3This represents a ceiling estimate, as individuals in those countries may not have internet, may not use Google Search, or may use Google Search in a different language than is covered by the Onebox. 4The “learn more” hyperlink within the Onebox brought users to a more expansive list of resources, including in some… view at source ↗
Figure 2
Figure 2. Figure 2: Interface states of the redesigned Google Search CSAM Onebox. [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Treatment effect over time. Week 0 represents data from Feb 12 (launch) to Feb 18 [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: European countries difference-in-differences analysis [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Traffic patterns from helplines, by region [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
read the original abstract

Google Search deploys a "Onebox" feature at the top of the results page when users conduct searches for Child Sexual Abuse Material. This study evaluates the impact of a strategic shift in this feature, comparing a revised intervention, focused on repercussions and therapeutic resources, to a previous iteration that focused on reporting. Using a difference-in-differences analysis of internal Google Search logs data, we found the new messaging resulted in a 3.8 percentage point reduction as compared to the status quo in subsequent CSAM-related queries within the same Search session. We found an average click through rate of 0.73% on any of the hyperlinked buttons to help-providing resources. Together, this research presents convergent evidence that a subset of individuals can be deterred from ongoing CSAM-seeking and redirected to therapeutic services.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper evaluates a change to Google Search's Onebox feature for CSAM queries, shifting from reporting-focused messaging to content emphasizing legal repercussions and therapeutic resources. Using difference-in-differences on internal search logs, it claims the revision produced a 3.8 percentage point reduction in follow-on CSAM queries within the same session relative to the prior version, alongside a 0.73% click-through rate on help-resource links.

Significance. If the identification strategy holds, the result supplies platform-level evidence that messaging can reduce continued harmful searches while increasing help-seeking, with direct relevance to content-moderation and safety interventions. The proprietary nature of the logs, however, precludes independent replication or external validation of effect sizes.

major comments (2)
  1. [Abstract / Methods] Abstract and Methods: the reported 3.8 pp reduction is presented without sample sizes, confidence intervals, the precise DiD specification (e.g., fixed effects, clustering), parallel-trends diagnostics, or any discussion of concurrent Search changes that could confound the treatment-control contrast.
  2. [DiD Analysis] DiD Analysis: the claim that the messaging revision alone accounts for the decline requires that no other alterations to query classification, ranking, or logging occurred during the rollout window and that no external shocks differentially affected CSAM-seeking behavior; the manuscript supplies none of the standard robustness checks (placebo tests, alternative event windows, or covariate balance) needed to support this isolation.
minor comments (2)
  1. Define the exact operationalization of a 'CSAM-related query' and of 'within the same Search session' so that the outcome variable is reproducible from the description alone.
  2. Report the click-through rate denominator (impressions or unique users) and any variation across the two messaging versions.

Simulated Author's Rebuttal

2 responses · 2 unresolved

We thank the referee for their constructive comments on our manuscript. We address each major point below. Due to the proprietary and privacy-sensitive nature of the internal Google Search logs, certain details (such as exact sample sizes) cannot be disclosed even in revision. We will make targeted additions to the methods and analysis sections where feasible.

read point-by-point responses

  1. Referee: [Abstract / Methods] Abstract and Methods: the reported 3.8 pp reduction is presented without sample sizes, confidence intervals, the precise DiD specification (e.g., fixed effects, clustering), parallel-trends diagnostics, or any discussion of concurrent Search changes that could confound the treatment-control contrast.

    Authors: We agree these elements should be reported. In revision we will expand the Methods section to specify the DiD model (including fixed effects and clustering), report confidence intervals around the 3.8 pp estimate, and summarize internal parallel-trends checks. We will also add a brief discussion of the rollout window noting that, per internal records, no concurrent changes to query classification, ranking, or logging occurred. Exact sample sizes cannot be provided because of privacy and proprietary constraints on the search logs. revision: partial

  2. Referee: [DiD Analysis] DiD Analysis: the claim that the messaging revision alone accounts for the decline requires that no other alterations to query classification, ranking, or logging occurred during the rollout window and that no external shocks differentially affected CSAM-seeking behavior; the manuscript supplies none of the standard robustness checks (placebo tests, alternative event windows, or covariate balance) needed to support this isolation.

    Authors: We concur that additional robustness evidence would strengthen the identification argument. The revised manuscript will incorporate placebo tests on non-CSAM queries, results from alternative event windows, and available covariate-balance checks. We will also explicitly state the assumption that no other internal changes coincided with the messaging update. Full external validation or release of the underlying logs remains impossible for proprietary and privacy reasons. revision: yes

standing simulated objections not resolved
  • Disclosure of exact sample sizes or raw search-log data for independent replication, due to Google privacy and proprietary-data policies.
  • External validation or re-analysis of the proprietary logs by third parties.

Circularity Check

0 steps flagged

No circularity: empirical DiD on logged data with no derivation or fitted parameters defining outcomes by construction

full rationale

The paper reports an empirical difference-in-differences analysis of internal Google Search logs comparing pre- and post-messaging-change periods for CSAM-related queries. No equations, first-principles derivations, parameter fitting, or self-citation chains are present that reduce the 3.8pp reduction claim or CTR to inputs by definition. The central result is a statistical estimate from observed data, not a tautology or renamed fit. This matches the default case of a self-contained empirical study with no load-bearing circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard assumptions of difference-in-differences causal inference applied to proprietary search logs; no free parameters, invented entities, or ad-hoc axioms are introduced in the abstract.

axioms (1)
  • domain assumption Difference-in-differences identifying assumptions (parallel trends, no anticipation effects, stable unit treatment value) hold for the search log data.
    Required for attributing the 3.8 pp reduction to the messaging change rather than other factors.

pith-pipeline@v0.9.1-grok · 5722 in / 1209 out tokens · 19126 ms · 2026-06-27T23:35:13.101814+00:00 · methodology

discussion (0)

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