Substack, originally a newsletter service, says its app now has millions of users interacting with its creators. By Benjamin Mullin and Jessica Testa Substack began its life as a buzzy newsletter ...

In April 2023, the newsletter platform Substack received an unexpected proposal from Elon Musk, who had recently purchased Twitter. Musk put it plainly: He wanted to buy Substack. At the time, he was ...

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