Overview

• On Monday an error caused Substack to send a push notification promoting NatSocToday, a Nazi-themed newsletter with fewer than 1,000 subscribers.
• Recipients expressed confusion and alarm online at being prompted to subscribe to a white nationalist publication.
• A Substack spokesperson apologized for the serious mistake, confirmed the system has been taken offline and said engineers are implementing fixes to prevent recurrence.
• Users who clicked NatSocToday’s profile were shown recommendations for other white-power content, exposing flaws in the platform’s algorithmic suggestions.
• The incident highlights Substack’s ongoing content moderation challenges as it continues to host extremist newsletters under existing policies.