Millions of people are expected to snatch up holiday gifts and gadgets today, not at crowded malls or outlets, but on the Web. It's Cyber Monday, the digital answer to Black Friday. The National Retail Federation estimates 123 million people will do some online shopping today. Many online retailers were offering deep discounts or free shipping to mark the day. If holiday weekend sales are any indication, this Cyber Monday may be the biggest yet. A record-breaking 226 million Americans went shopping over the long holiday, and spent an estimated $11.4 billion on Black Friday, according to retail research group ShopperTrak.Tech experts warn that digital discount hunters should be wary of Cyber Monday scams. They advise shoppers to only buy from companies that they know and trust, and recommend making sure that the site's URL says "https," which indicates a secure server, before entering credit card numbers.