Facebook Ad Rates Hold as Inventory Rises, Easing Price Concerns

Facebook Inc., the biggest social network, said advertising rates have held up even after it added new ways for marketers to promote products, allaying concern that prices would decline as inventory surged.

Rates for so-called self-serve ads, which are sold through an automated auction system and account for most of sales, are unchanged since March, when the company completed a redesign to add promotions under photos and increase the number of spots on some pages to as many as five from three, Facebook said.