Rebecca black
Rebecca Black had the most popular YouTube video of 2011. - 

This final note today -- which I believe qualifies as this week's sign the apocalypse is upon us.

My colleague John Moe noted this morning that we -- collectively -- watched a trillion YouTube videos this year. One trillion. That's 140 videos for every person on the planet -- if all of us actually watched videos.

But here's the thing.  Of those thousand billion videos, this one -- this one -- was the most watched:

Rebecca Black. "Friday."

I'm a little embarrased for us, actually.

Follow Kai Ryssdal at @kairyssdal