#Substack signs ex-Forbes writer as it seeks to disrupt book publishing
“#Substack signs ex-Forbes writer as it seeks to disrupt book publishing” Substack, an online subscription platform for popular writers like Glenn Greenwald and Andrew Sullivan, appears to be setting its sights on disrupting the book publishing world. Former Forbes media and entertainment writer Zack O’Malley Greenburg has revealed to Media Ink that he has received…