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 ...
Hamish McKenzie materialized from a balcony looking over the lobby of the Line hotel in Washington, D.C., on Saturday night. The Substack co-founder and “chief writing officer” had flown in from San ...
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