Love this episode of Reply All, about trying to track down a radio hit that you remember vividly from the 90s, but that somehow doesn't exist anywhere on the internet.
The most annoying part of joining a new social media platform is trying to rebuild your social graph from the last time you did so. Where Mastodon might win for me is in Local Timelines. If you have enough communities with fairly clearly defined limits (like idlethumbs members), you can depend on the local timeline to basically just give you a feed of what you're looking for without having to find every single idlethumbs forum member's mastodon account to follow from your main one
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!