#Trunk is a community-run directory of people on the Fediverse who are looking for followers:
It's opt-in, so people only get listed if they specifically ask to be there.
It's organised by topic, and you can follow individuals or the entire list for that category.
I'll have to remember to look at this later.
mastodon.at is a microblogging site that federates with most instances on the Fediverse.