Up to $4 trillion worth of merchandise will languish unpurchased in online shopping carts this year. No wonder trying to build a frictionless buy button remains a crucial effort in online commerce.

Visa and Mastercard have surfaced the idea of a universal 'buy button' as a way to deliver a common, secure checkout experience across all merchants selling online. Will it work?

Newegg unveils Group Buy, a daily deal requiring a minimum customer population to unlock. Encouraging social shopping, users invite friends to join.