Yikes! Yet another merchandising ploy, Cyber Monday after Black Friday?
Actually, the name was put on a trend noticed in 2005, when online sales increased as people returned to work and used high-speed computers there to shop (see New York Times article).
Nowadays, it seems, you can run up your credit card by using an app on your IPhone to compare prices for an item and then purchase it on the spot. Employers have gotten wise to online shopping at work and people have been fired for Cyber Monday antics, so be careful out there.