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I don't think that RoR is the cause of Diaspora's failure. And in my opinion, saying this sounds a little bit like cargo culting.

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Diaspora also uses Mongodb... At least I'm one person who was repelled from installing Diaspora because of its prerequisites. And I say that as someone who started programming when I was 7.

They migrated to a relational database about 4 years ago: http://www.slideshare.net/sarahmei/taking-diaspora-from-mong...

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