Dear Pal,

I cannot reach the page you gave reference to. Can you check it?

I found it: https://www.quora.com/What-is-the-total-angular-momentum-of-the-universe-Is-it-possible-for-it-to-have-non-zero-angular-momentum

However this does not count as a reference.

Dear Preston Guynn thanks for the reference. It looks like an interesting one because of its relation to the Mach's principle.

Edit: I also found the following article. It may be useful to some.

Article How Isotropic is the Universe?