Nike's digital sales grew 84% last quarter as many established brands prepare to accelerate their direct-to-consumer strategies in 2021.

Amazon sellers can no longer comment on product reviews, which could increase the risk of lost sales and reputation damage from negative reviews.

Clothing and apparel retailers are continuing to see steep declines in 2020, with sales well below 2019 levels.

eMarketer principal analyst Debra Aho Williamson, senior analyst Jasmine Enberg, and junior analyst at Insider Intelligence Blake Droesch discuss what they're paying attention to in 2021, and why: the rise of social entertainment, WhatsApp's next move, and stalling social commerce.

The coronavirus pandemic boosted social media usage around the world, as many people stayed home for weeks or months. In 2020, there will be nearly 150 million more social network users worldwide than we expected before the pandemic—more than the entire population of Russia. That will lift the total to 3.23 billion, well ahead of our predictions in November 2019 and June 2020. As a result, nearly 81% of internet users worldwide will be social network users.