There were 24.1 million tweets during Super Bowl XLVII

"The game is over, the confetti has descended, and #RavensNation is celebrating their big victory. During the Sunday matchup between the @ravens and @49ers, the roar of the crowd was comprised of 24.1 million Tweets about the game and halftime show (this leaves aside the ads, about which more below). By the beginning of the second half, the volume of Tweets had already surpassed last year’s Tweet total.
The moments generating the biggest peaks of Twitter conversation (measured in Tweets per minute, or TPM) during the game:
- Power outage: 231,500 TPM
- 108-yard kickoff return for Ravens TD by Jones: 185,000 TPM
- Clock expires; Ravens win: 183,000 TPM
- Jones catches 56 yard pass for Ravens TD (end of 2nd quarter): 168,000 TPM
- Gore TD for 49ers: 131,000 TPM
Tonight’s most mentioned players were (in order): Ray Lewis (@Raylewis), Joe Flacco (@teamflacco), Colin Kaepernick (@Kaepernick7) and Jacoby Jones.
[...]

The other superstar on the field tonight was @Beyonce. Her halftime performance lit up Twitter (did it affect the Superdome power grid, we wonder?), generating 5.5 million Tweets. Fans’ favorites reflected by Tweet volume:
 - Conclusion of her show: 268,000 TPM
- Destiny’s Child reunion on stage: 257,500 TPM
- Singing ‘Single Ladies’: 252,500 TPM"

Source:  Twitter blog, 3rd February 2013