Fast National ratings for Friday, December 12, 2014.

Even a relatively weak performance by "Shark Tank" still helped ABC lead Friday night among young viewers, while "Blue Bloods" and "Hawaii Five-0" led CBS to its normal comfortable overall win.

NBC's "Grimm" and "Constantine" were both up week to week, continuing a recent pattern of very small rotating up and down fluctuation. 

And over on The CW, an encore of TNT's "The Librarians" premiere drew a large, by CW standards, overall Friday audience. 

On to the numbers...

Among adults 18-49, ABC averaged a 1.3 rating for Friday night, tops in the key demographic. NBC was second with a 1.2 key demo rating, followed closely by the 1.1 key demo rating for CBS. FOX averaged a 0.6 key demo rating, while The CW did a 0.4 key demo rating for the night.

Overall, though, it was CBS winning Friday primetime with 8.6 million viewers and a 5.5 rating/10 share,e far ahead of the 6.13 million viewers and 4.0/7 for ABC. NBC was third with 5.18 million viewers and a 3.4/6. FOX's 1.1/2 and 1.76 million viewers edged out the 1.0/2 and 1.56 million viewers The CW.

8 p.m. - "Dateline" won the 8 p.m. hour for NBC with 7.19 million viewers and a 1.3 rating among adults 18-49, comfortably topping the 5.94 million viewers and 1.1 key demo rating for CBS. ABC was third with "Last Man Standing" (6.04 million and a 1.1 key demo) and "Cristela" (4.54 million viewers and a 0.8 key demo). The first hour of a "MasterChef Junior" double encore averaged 1.69 million viewers and a 0.6 key demo rating on FOX, topping the 1.56 million viewers and 0.4 key demo rating for "The Librarians" on The CW.

9 p.m. - "Hawaii Five-0" won the 9 p.m. hour overall for CBS with 8.74 million viewers and finished third with a 1.1 rating among adults 18-49. ABC's "Shark Tank" was on the low side with 7 million viewers and an hour-winning 1.5 key demo rating. NBC's "Grimm" averaged 5.05 million viewers for third and a 1.3 key demo rating for second on the hour. FOX's "MasterChef Junior" encore averaged 1.82 million and a 0.6 key demo rating, again edging out the 1.56 million viewers and 0.4 key demo rating for The CW's airing of "The Librarians."

10 p.m. - "Blue Bloods" drew the night's biggest audience with 11.11 million viewers for CBS in the 10 p.m. hour, coming in second with a 1.2 rating among adults 18-49. ABC's "20/20" was second with 6.11 million viewers and led with a 1.4 key demo rating. And NBC's "Constantine" trailed with 3.295 million viewers and a 1.0 key demo rating.

All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.

A long-time member of the TCA Board and a longer-time blogger of "American Idol," Dan Fienberg writes about TV, except for when he writes about movies or sometimes writes about the Red Sox. But never music. He would sound stupid talking about music.