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I agree but Ripple is a bit too centralised to be counted in the rankings. As I see it, Ripple is like a bank that uses blockchain on their backend. If I add it, I would have to add any bank in the world that start using blockchain at some level.
That's why, at least for the moment, I didn't look into add Ripple. I want Blocktivity homepage to reflect the activity on fully decentralised blockchain projects.
Now Blocktivity is open sourcing, if ppl want s to add a section with banks using blockchain, or simply a copy of the home page matrix but including Ripple, it is possible !
As for the other blockchains, indeed, it's time to add them !