It's Cyber Monday - the biggest day of the year for online sales.

Sales are expected to be up this year, as the appeal of Cyber Monday goes global.

Analysts say social media and more savvy online shoppers overseas are getting more excited about the deals they can score from U.S. retailers today.

Where is the biggest overseas online chatter around Cyber Monday?

Analysts say it's from Europe, China, Australia and South America.

This Amazon fulfillment center in central England was preparing for ITS Cyber Monday, the busiest day for online shopping in Britain.

But all those great deals and free shipping today could actually take a toll on margins.

Meanwhile, in the U.S., many consumers are still under financial pressure.

U.S. retailer's biggest concern?

Shoppers could close their wallets just as easily, as they opened them up the last few days.