I don't think this is true at all. There was the one team at Yammer, but overall, it seems as if Netflix and LinkedIn are pushing forward with Scala adoption,

I don't think this is true at all. There was the one team at Yammer, but overall, it seems as if Netflix and LinkedIn are pushing forward with Scala adoption, and Twitter, FourSquare, Tumblr, Klout, Gravity, and many others are already committed scala shops.