Substack data breach exposed user email addresses and phone numbers for months before CEO Chris Best confirmed the October ...

Substack says hackers accessed user emails, phone numbers, and internal metadata in October 2025, with a database of 697,313 records later posted online.

Substack announced today it’s bringing its “Chat” feature to the web after launching it on mobile last November. Chat allows writers to communicate directly with their loyal readers right on Substack.

Add Yahoo as a preferred source to see more of our stories on Google. The company says the app makes it easier for writers to get new subscribers and for readers to explore and sample Substacks they ...