Facebook newsfeeds will contain fewer ads for products or services that users are not interested in, Facebook Inc said on Friday, announcing changes in advertising policy.
It was the Web company's latest effort to refine the newsfeed ads that have become more important to its business.
"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.
Facebook has been trying to make ads more prominent without triggering a backlash among its 1.15 billion users.
The world's No 1 online social network, which generates roughly 85 per cent of its revenue from advertising, now injects one paid ad into every 20 "stories" users see in their newsfeeds, the company said in July.
While big brands such as Toyota and AT&T advertise on Facebook, the company also makes money from marketers of weight-loss and teeth-whitening products. Analysts say some users may not welcome these less-glamorous pitches in their newsfeed.
Forrester Research analyst Nate Elliott said Facebook needs to take steps to keep the latter category of ads in the less intrusive, right-hand side of the Web page, while reserving the space within users' newsfeed for higher-quality ads.
"If Facebook allows unappealing advertising to invade that space then they're in trouble. That harms the user experience, and reduces the value of that inventory for high-quality marketers," Elliott said.
Facebook said some marketers "may see some variation in the distribution of their ads" in coming weeks. The company did not elaborate.
Shares of Facebook finished Friday's regular trading session up 1.7 per cent at $51.24, the highest closing level since the company went public in May 2012.