Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked.

Substack, which was founded as a newsletter platform, is trying to make itself an alternative to Twitter by adding social features to its publishing site. On Nov. 3, the platform launched a chat ...

Substack won't share official numbers, but it seems like a pretty significant data breach.

Like clockwork, every Wednesday morning, Russ Thornton, an Atlanta-based advisor who specializes in helping women with retirement planning, publishes a financial newsletter called “Wealthcare for ...

Substack said that customer data was accessed in October 2025, but wasn't discovered until early February.

Substack confirms a major data breach exposing user emails and phone numbers. What’s behind the breach, and what’s next?

Substack Inc. today launched Notes, a platform where Substack creators can interact with subscribers and where the entire experience looks very much like Twitter. The differences are only in the ...

Exclusive: Site takes a cut of subscriptions to content that promotes far-right ideology, white supremacy and antisemitism ...

Andreessen Horowitz is betting that there’s still a big opportunity in newsletters — the venture capital firm is leading a $15.3 million Series A in Substack. Also, a16z’s Andrew Chen — a blogger and ...