[chillfox]

There's an argument to be had that they would not have been successful enough to need to scale without the speed of development provided by Ruby.

[jaimex2]

Yep, also a lot just migrated some components to more suitable languages but the for the most part remained Ruby.

You can scale anything if architected right.

You can't make languages fast and fun to write in if they aren't that to begin with. There's a lot to be said for dev morale and productivity.