Still not seeing my toots from socialist.city show up here. Not sure whats missing.
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!
@tdfischer I think the creator of mastodon social blacklisted that instance. No idea. He blacklist instances based in 2 things:
1) Wrongthink (aka disagree with them)
2) Posting lewd images