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by subfay 2655 days ago
None of them is on a standard unmodded Rails stack.
2 comments

I'm not sure any highly-scaled, mature application is on a standard unmodded anything stack.
Basecamp is always on the latest or beta version of rails, Rails 6 at the moment. GitHub has recently updated to version 5 and are merging a large mount of their scaling gems for version 6.

There are some podcasts and keynotes where DHH talks about their stacks.