Well, one correlation is that Google's coding style for C++ uses spaces and the .cc extension. It stands to reason that some fraction of Google alumni would co

Well, one correlation is that Google's coding style for C++ uses spaces and the .cc extension. It stands to reason that some fraction of Google alumni would continue to use both practices in their own work. I don't know if its enough to push a 36% tab usage to 7%, but might account for a solid fraction thereof.