I also made one on kbin.social. Normally, anyone using one can participate on the other, but I think kbin is currently dealing with a DDoS and its countermeasures are making problems.
I'm making a page on my own site to link from the subreddit's blackout notice.
Hey Zak, where can I read up on the federaton between platforms? I might actually get on Mastodon (I was never a Twitter user) if all these platforms are connected. Also, is there consensus yet on wether we're coming here or kbin?