And then by chance I met the person who designed the Critical Mass Karlsruhe's logo, Steffen. I commented on his cool t-shirt, got talking and so on :).
Very very small instance for feminists. Right now this instance is only moderated by Gaba & Anne with anne-and-gaba-kind-of-rules and it is invite only. If you want an invite send a message to gaba at systerserver.net.