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The top five terms that day were SOPA, Stop SOPA, PIPA, Tell Congress and #factswithoutwikipedia.
The surge of tweets were related to the massive Internet protest against the Stop Online Piracy Act (SOPA) and its sister bill PIPA. During the protest, online services such as Wikipedia and Reddit went offline for the better part of the day, and other major web players, such as Google and Facebook, also expressed their disapproval of the bills.
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As for the contents of the tweets, the popular terms "Stop SOPA" and "Tell Congress" reveal that most Twitter users also oppose these bills.
Twitter, which has been known to suffer outages due to traffic surges in the past, worked without noticeable glitches.