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Fortune
Fortune
Steve Mollman

Substack was hamstrung by Twitter right after it announced a rival service

(Credit: Stephen McCarthy—Sportsfile for Collision via Getty Images)

Twitter under Elon Musk has been unpredictable, to say the least. In its latest surprise move, the social network abruptly altered the way it interacts with Substack, a popular newsletter platform. The change came right after Substack announced Notes, a Twitter-like service.

Substack announced Notes on Wednesday, explaining that users “will be able to post short-form content” on “almost anything—including posts, quotes, comments, images, and links.”

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