A friend who worked in the media / broadcasting industry explained the whole "Billboard" system to me many years ago. Here's a synopsis of his comments:
"Have you ever noticed a radio announcer introducing a brand new release by an artist, by describing it as a hit? This should tell you something. It's not a hit because of popularity, because no one's heard it yet! It's a hit simply because the artist's agent has paid for promotional time on the mainstream networks. In other words, the public is being told that a song is a hit that they should like, whether or not that's warranted."
I've never been one to permit someone else to tell me what I should or shouldn't like. Just because something's "popular" doesn't mean it's any good, or (more to the point) something I have to like because "the star maker's machinery" (Joni Mitchell) is telling me I should. The link to the Billboard list contains two Canadian embarrassments IMHO, being Justin Beiber and Drake.
(This concludes my daily rant )