Hm, I'd want to integrate a user count graph into joinmastodon.org somehow, but it's not as easy as it sounds. I don't think there's anywhere to get the data from programmatically. I'd have to build a stats aggregator myself...
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@metanol @Gargron I think that's intentional, you are actually able to search posts that have relevance to your account (posts you interacted with, etc.)