Decentralised and open source social network.
https://mastodon.art is fantastic. I'm on the .social instance, but use it to find artists to follow.
I never really followed anybody on Twitter, but the Mastodon art community is incredible. Some artists I followed there are Galmesh Rosewood, Misnina, and Milady de Winter.
mastodon.art is quite controversial, as it probably has the longest instance blocklist far and wide: https://fba.ryona.agency/?reverse=mastodon.art
Of course, there is a lot to moderate, but there are definitely many among them that are anything but known for tolerating or spreading problematic content.