Online shopping can be both a blessing and a curse during the holiday season. On the one hand, we can avoid all those pesky lines and slow-moving consumers at brick-and-mortar retailers. But on the other, we have to rely on retailers and delivery companies to ship all of those gifts and deliver them on time. Unfortunately, at least one major shipping service has admitted that it was caught off guard by unprecedented demand. Speaking to The Wall Street Journal, a UPS spokeswoman said that “the volume of air packages in the UPS system did exceed capacity.” According to IBM Digital Analytics, online retail sales increased 37% over last year during the weekend before Christmas as last-minute shoppers rushed to beat the