"Traitor Baru Cormorant" by S. Dickinson is a book, and I just got to its finish.
It's about fighting colonization in a fictional world from within a colonizing nation's own organization.
I would say that it's good, but also sad and hard to stomach, on account of folks having no good options within an organization built on subjugation.
Mastodon is a "FOSS" social sharing hub. A multi-host substitution for capitalistic platforms, it avoids risking a particular company monopolizing your communication. Pick a host that you trust — you can still talk with all hosts running Mastadon. Any individual can run a Mastodon instantiation and join in this social hub in a jiffy.