Version History

• June 16, 2026 v1 low
  Substack updated its privacy policy footer on June 16, 2026 to add a reference to 'Brand Partnerships' in the navigation section. The change adds a link to a new resource or section called 'Brand Partnerships' where previously this link did not appear in the footer menu. This appears to be a navigation and resource disclosure change rather than a substantive modification to privacy terms or data practices.
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• June 5, 2026 v1 low
  Substack replaced one third-party tracking vendor with another in their privacy policy. The policy previously listed AdQuick as a persistent tracking pixel for third-party analytics; this vendor reference has been removed and replaced with muxData, which collects anonymous video metrics. The practical effect is a change in which vendor processes tracking data on Substack's platform, though both serve analytics purposes.
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• May 19, 2026 v1 low
  The navigation footer of Substack's privacy policy page was updated on May 19, 2026 to include comparative product links. Specifically, 'Substack vs. beehiiv' and 'Substack vs. Patreon' navigation items were added to the footer menu. This is a navigation and site structure change with no material impact on the privacy policy terms themselves.
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• May 15, 2026 v1 low
  Substack updated its privacy policy on May 15, 2026 to disclose that it shares account identifiers with child safety industry consortia and now receives information from those consortia to detect child sexual abuse material (CSAM). The policy also added language stating that Substack may obtain additional information from third parties, combine it with platform data, and use the combined information to provide safer experiences and improve the platform and analytics.
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• May 6, 2026 v1 low
  Substack's privacy policy now discloses that the company shares account identifiers with child safety industry consortia to detect child sexual abuse material (CSAM). This is a new transparency disclosure added on May 6, 2026, informing users that their account information may be shared with industry organizations working to identify and report CSAM.
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• May 5, 2026 v1 medium
  Substack updated its privacy policy on May 5, 2026 to disclose that it shares account identifiers with child safety organizations to detect child sexual abuse material, added a one-month deadline for responding to privacy rights requests, and clarified that direct message recipients may retain messages even after deletion. The policy also now specifies that only material changes to the privacy policy will trigger user notification.
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• April 19, 2026 v1 medium
  Initial snapshot — monitoring begins
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