Ask HN: Why is so little known about Apple, it's culture?

Time and again, I come across articles on HN and other tech site that talk about the Corporate culture at Google and Microsoft. We see images of Google Employees skateboarding in their offices and game station they have in their offices.

But I have never seen anything about Apple and its corporate culture. I don't think anybody there tweets either.

I am aware of Apple secretive nature about its products, but I was not sure if this applied to other parts of the company as well.

Does anybody has any idea?

Thanks.