[jfengel]

That's exactly it. Solar systems and galaxies have net rotation, and maybe even galactic clusters.

But there is no reason to think that the universe has a net rotation. It could have one; you don't need a frame of reference to detect rotation. (The same way you feel centrifugal force.)

It would be huge if it were shown to have a net rotation. So huge that I take this claim with skepticism until heavily confirmed.