With millions of Americans expected to log on and keep on this Cyber Monday, it’s the biggest online shopping day of the year since 2010. Although, fewer people overall are expected to shop today because of earlier online promotions, the day could take on added importance after a Thanksgiving weekend that saw fewer shoppers and lower spending than last year. Retailers have been pushing "cyber" deals all month and will continue to do so this week, dubbed "Cyber Week." Research firm comScore says e-commerce spending for the first 28 days of the November and December shopping season totaled $22.7 billion, up 15 percent from last year. Sales jumped 32 percent to $1 billion on Thanksgiving Day and 26 percent on Black Friday to $1.51 billion. The firm expects people to spend about $2.5 billion today alone.