None of those hold Java as the "Lingua Franca" of the respective companies. Even remotely. No one doubts that you can find Java somewhere in any reasonably sized company, or as a largely inconsequential basis for a product they use (such as HBase), but only extreme hope can lead someone to conclude that makes it a principal technology.

If you cared to read the given links, or even search a bit yourself, you'd see that, for example, Twitter has replaced the original Ruby architecture by Java.