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 ...

Casey Lewis never thought she would sell advertising space. Now the journalist who puts out a Substack newsletter called After School is finding herself in the world of contract negotiations and rate ...

Substack is taking a step it has avoided for years. The company has begun quietly testing sponsorship placements inside newsletters, according to Adweek, giving a small group of writers the option to ...

The rise of the creator-centered platform Substack has opened a new avenue for PR teams aiming to reach audiences through voices they already trust. Creator-journalists on the platform build loyal ...