After Substack shocked an unknown number of users by sending a push notification on Monday to check out a Nazi blog featuring a swastika icon, the company quickly apologized for the "error," tech columnist Taylor Lorenz reported.
"We discovered an error that caused some people to receive push notifications they should never have received," Substack's statement said. "In some cases, these notifications were extremely offensive or disturbing. This was a serious error, and we apologize for the distress it caused. We have taken the relevant system offline, diagnosed the issue, and are making changes to ensure it doesn’t happen again."
Substack has long faced backlash for allowing users to share their "extreme views" on the platform, previously claiming that "censorship (including through demonetizing publications)" doesn't make "the problem go away—in fact, it makes it worse," Lorenz noted. But critics who have slammed Substack's rationale revived their concerns this week, with some accusing Substack of promoting extreme content through features like their push alerts and "rising" lists, which flag popular newsletters and currently also include Nazi blogs.
Joshua Fisher-Birch, a terrorism analyst at a nonprofit non-government organization called the Counter Extremism Project, has been closely monitoring Substack's increasingly significant role in helping far-right movements spread propaganda online for years. He's calling for more transparency and changes on the platform following the latest scandal.
In January, Fisher-Birch warned that neo-Nazi groups saw Donald Trump's election "as a mix of positives and negatives but overall as an opportunity to enlarge their movement." Since then, he's documented at least one Telegram channel—which currently has over 12,500 subscribers and is affiliated with the white supremacist Active Club movement—launch an effort to expand their audience by creating accounts on Substack, TikTok, and X.
Of those accounts created in February, only the Substack account is still online, which Fisher-Birch suggested likely sends a message to Nazi groups that their Substack content is "less likely to be removed than other platforms." At least one Terrorgram-adjacent white supremacist account that Fisher-Birch found in March 2024 confirmed that Substack was viewed as a back-up to Telegram because it was that much more reliable to post content there.