In just one week leading up to Christmas, Amazon added more than 3 million new Amazon Prime members, the tech giant is boasting. “It’s the latest sign of growth for the company’s $99/year free-shipping and video-streaming subscription service, which has emerged as a key driver of its business,” GeekWire notes. “The company doesn’t publicly disclose the actual number of Amazon Prime members, just saying it’s in the ‘tens of millions.’”