The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised.

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

If you’re impacted by the security incident, you’ll hear directly from the brand with an email from Substack's CEO.

"We're moving quickly," Farrah Storr, head of international at Substack, tells THR after hiring Mark Swierszcz as its new Canadian head of partnerships, with more country hires in the works worldwide.

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