Facebook newsfeeds will contain fewer ads for products or services that users are not interested in, Facebook Inc said on Friday. "When deciding which ad to show to which groups of people, we are placing more emphasis on feedback we receive from people about ads, including how often people report or hide an ad," Facebook said.

"If someone always hides ads for electronics, we will reduce the number of those types of ads that we show to them," the company said.

The world's No.1 online social network, is showing one paid ad into every 20 "stories" users see in their newsfeeds, the company said in July.

Facebook has been trying to make ads more prominent without triggering a backlash among its users.