pleroma.site registrations are open for the influx of new fediverse users.
please read our TOS, especially the part about media uploads and tagging adult content NSFW/Sensitive, as we take untagged content quite seriously.
beyond that, content and users of all non-extremist political ideologies are welcome here.
some advantages of using Pleroma instances verses Mastodon instances for tumblr users:
Markdown support (for post formatting)
Advanced post filtering
High personal customizability of the web client
You might also try kawen.space, or catgirl.science, which would also be good instances for Tumblr migrants.