I’m starting to find some of the cooler aspects of the wider fediverse.
For instance, Lemmy is a Reddit clone that is picking up some migration after the recent hooha or at Reddit.
The cool thing is that it’s federated (same as mastodon, different instances and everything).
This means that you can subscribe to any community on Lemmy, for instance
https://lemmy.world/c/showerthoughts
through its fediverse address, right here on your mastodon instance:
If you want a combination of following people and communities, that’s basically the premise of Kbin, if I understand right. Not sure they support hashtags, though.