Marc Lore, Walmart's US e-commerce leader, will leave the company nearly five years after the retail giant acquired his startup Jet.com and Lore joined to help steer Walmart's growing e-commerce efforts. Lore, whose other startups include Quidsi, which was acquired by Amazon, said he'll retire from the company at the end of January and plans to keep working with startups.

Gain insights into how Google is helping retailers accommodate a digital-first customer journey in this NRF 2021: Retail's Big Show -- Chapter 1 session. You'll hear insights about recent consumer behavior changes and how retailers are paving a path forward for success in 2021. Learn more and register to view this and other sessions from the first week of the virtual event.

Wayfair's increased investments in customer service have encouraged more consumers to shop for furniture online, CEO Niraj Shah said at NRF 2021: Retail's Big Show -- Chapter 1. The online furniture retailer is forecasting 2020 revenue of $14.2 billion, a 56% gain.

Mattel's Barbie is reaping the rewards of launching more inclusive products and the rising popularity among children and is using digital marketing to continue the momentum. Lisa McKnight, who oversees Mattel's Barbie and dolls lineup, talks about this approach, which includes Barbie's YouTube vlog, where she's talked about social justice, the Dream House Adventures app, which surpassed 71 million downloads, and launching "high-profile fashion partnerships."

YouTube is testing linked video tags that let viewers find out more about products and make purchases. Similar features are under development at Pinterest, and would link items in Lens displays to similar products as well as giving brands more Pins options.

Streaming platform Twitch has grown exponentially since the start of 2021, jumping from 17 million daily users to 27 million, as it continues to add more nongaming content focused on everything from cooking and music to sports and fashion. In this interview, Chief Marketing Officer Doug Scott discusses the launch of performance marketing campaigns, why more brands are attracted to the platform and its growing pool of marketing tools such as the Bounty Board and multiplayer ads.

Digital investments paid off for Signet Jewelers, which reported a 60% surge in online sales during the holidays. Over the last year, the retailer closed several hundred brick-and-mortar stores and put an emphasis on e-commerce.

In observance of Martin Luther King Jr. Day in the US, SmartBrief will not publish Monday. Publication will resume Tuesday.