Fewer tweets during second debate

There were 7.2 million tweets during the second presidential debate on Tuesday night — fewer than the 10 million tweets during the first presidential debate in Denver, according to Twitter.

But both presidential debates easily topped the 3.8 million tweets during the vice presidential debate.

Users were sending 109,560 tweets per minute at the peak moment during Tuesday's debate, when the candidates discussed immigration and Romney slipped on a questioner's name.

The economy was the most discussed topic, followed by taxes, foreign policy, energy and immigration.

The fastest-rising buzzword for the debate was "binder," after Romney said he chose from "binders full of women" for senior staff appointments when he was governor of Massachusetts. "Pension" and "Jeremy" (a college student who asked a question) were also popular terms.

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