From Nielsen for the week of Dec. 29, 2014 through Jan. 4, 2015:

“‘Dick Clark’s Primetime New Year’s Rockin’ Eve with Ryan Seacrest’ topped the Nielsen Twitter TV Ratings (NTTR) Weekly Top Ten Series and Specials list with 328,000 event‐related tweets that were seen by a unique audience of 4.7 million people.

“In sports, the Florida State vs. Oregon Rose Bowl game topped the list
with 2.5 million event‐related tweets sent in the U.S. that were seen by a unique audience of 10.1 million people.”

Here is the top-10 chart for “Series and Specials,” followed by the top -10 chart for “Sports.”