Twitterでは4月7日ごろから、メルマガ配信サービスSubstackのコンテンツリンクを含むツイートを制限されていると、多数のユーザーが報告した。Substack.comへのリンクのツイートは可能だが、そのツイートをRTまたはいいね！しようとすると「このツイートでは ...

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

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

The hacker claims to have stolen nearly 700,000 Substack user records, including email addresses and phone numbers.

The digital publishing platform Substack has told some of its users that their data was stolen in a security breach. The ...

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

Blogging platform Substack warns users that their phone numbers and email addresses were compromised as a hacker claims a ...

Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked. Here’s what you need to know.

Over the past few days, a war between subscription-based blogging website Substack and microblogging platform Twitter has been brewing — with the CEOs of both platforms publicly responding to the ...