Nielsen said 98.7 million people, on average, were watching Pittsburgh's exciting 27-23 victory Sunday night. That beats the 97.5 million who watched the 2008 game, which held the record for most popular Super Bowl.
On Monday, Nielsen had reported that this year's game had 95.4 million viewers -- impressive, but not a record-setter.
Nielsen explained the discrepancy of more than 3 million viewers by saying a more complete check of their records revealed additional viewership on some digital tier networks. The company hadn't been aware that they were showing the game.