Groupon expects to roll out a revamped mobile app.
-- Online revenues increased by as much as 172% for some sites during the last two weeks of the holiday shopping season compared with the same period in 1999.
-- Average revenue-per-order decreased as compared with the 1999 holiday season while the average number of orders increased.
-- Gift certificates sales, the most popular items purchased, were 2-4 times greater than the previous year for some sites.
-- Peak revenue days were Dec. 11th and 12th, earlier than the peak revenue days in 1999.
-- Peak visitor days were December 11th through December 15th.
-- A second spike of traffic hit early during the week of Dec. 18, possibly indicating that site visitors may have been looking for last-minute bargains.