Re:Open Sourcers Race to Build Better Versions of Slack
by tlrobinson on Wednesday March 16, 2016 @11:52PM
(#11302470)
Surely there were networks that went defunct before 2011. That's probably when they started paying attention.
And all IRC implementations are "interoperable" in the sense that a single client that implements the protocol can connect to any of them, this chart seems to be padding things a lot by calling every IRC server network a "chat service". A number of them also have or have had interconnects with each other in the past.