Facebook Will Ban Sellers of Shoddy Products

New feature lets shoppers share their experiences; negative feedback could lead to bans

Facebook Inc. is cracking down on e-commerce businesses that flood users’ feeds with ads for products that are unsatisfactory or don’t arrive on time.

The social-media giant is rolling out a new feature that lets people leave feedback about their shopping experience after viewing a Facebook ad. The company said it is warning businesses that receive a high volume of negative feedback to give them a chance to address the grievances. If feedback doesn’t improve over time, Facebook will reduce the number of ads that businesses...