Not all of you use these features. Some of you might not have seen them. But I can speak to their effectiveness: In 2023, we added more than 70,000 free subscribers. While I would love to credit that growth exclusively to our journalism and analysis, I believe we have seen firsthand how quickly and aggressively tools like these can grow a publication.

The features referred to here are the network and engagement tools that Substack has built over the last couple years. Mainly Notes and recommendations. These are powerful tools of engagement and discovery. Maybe, just maybe ActivityPub offers the same rolling power to any site on the internet and not just custom, closed silos?