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> Twitter using Scala and they ended up completely backing away from it. Yikes.

What are you talking about, I just searched and found zero supporting sources

I've seen people say this but never any real source. Maybe they're mixing up Twitter and Linkedin?

Can you people not google? I just typed "twitter scala" and got the following results on the first page:

None of the links you just shared have any mention of Twitter moving away from Scala, which is presumably the question.

I suspect he means Yammer, not Twitter, perhaps from this: https://gist.github.com/anonymous/1406238