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An excellent overview can be seen on my helpful contact @stefan 's website, https://jointhefediverse.net/join, in case you haven't seen it.
He has even updated "#Firefish" for "Calckey" and I'm sure the ugly "X" will replace #Twitter for good soon, too.
#BookWyrm is hopefully going to replace #Goodreads (controlled by #Amazon, I think) some time.