Amazon.com reported its record sales day, according to Internet Retailer, tallying 2.8 million items sold. The e-commerce giant declined to say which day that was in this holiday season, or how much revenue that entailed, or even which categories of merchandise comprised it. Amazon.com did reveal that it had 700,000 Americans visit the site within one hour, it shipped goods to 217 countries and managed to have a day of sales that averaged about 32 items sold every second.