Who is "JayZ" ? Somebody important, I assume?
(Searching JayZ on google yields About 123,000,000 results.)
- How do you know if someone doesn't own a television? They tell you.
The Onion article is just an elaborate version of the joke.
The joke here is people making a big deal about not knowing who Jay-Z is, to the extent they post comments about how they don't know it - rather than just google his name if they were curious. Which indicate that the do know who he is, but want to make a show of being the kind of guy who don't know who someone Jay-Z is.
Dubmood OTOH, is excellent.