My interview with @blaine, who was there at the very beginning of Twitter; now he's focused on building #fediverse infrastructure that will help #Mastodon scale. https://thenewstack.io/why-a-twitter-founding-engineer-is-now-all-in-on-mastodon/
+1 and I think there is a lot of room for non-masto application categories that do interesting things with aggregation of activitypub-sourced content and indexes. It could allow you to eg create a river of news community that's basically links indexed from feeds based on topic etc.