Add Substack to the list of platforms frustrating to PR -- Product Hunt, Stack Overflow, Reddit, Quora -- that command attention but aren't pitchable like publications. Founded in 2017, Substack is a publishing platform for indie newsletter authors. It's cool and we'll get into why, but Substack's web site is more or less a metaphorical black box.
Are there more than 99 newsletters out there? Of course. But these 99 -- as presented in our fresh Google Doc -- are the ones that will matter most to you. We link to them, describe them, assess frequency and whether they're pitchable. Contributing editor Lindsay Ciulla delivered awesome research.