Facebook yesterday began serving up video ads that pop up and play when users check their news feeds.

The leading online social network said it is testing the new advertising technique this week with a clip teasing the new film "Divergent".

"Since September, we’ve been testing a way to make videos more engaging on Facebook, and as a result we’ve seen views, likes, shares and comments increase more than 10 percent,” the California-based firm said in a blog post.

"We’re beginning to test a similar video viewing format for advertisers".

Video ads will play on mobile devices as well as when people visit Facebook from laptop or desktop computers.

On smartphones or tablets, video ads will be pre-loaded in the background when in range of wireless hotspots to avoid the rich downloads eating into users telecom service data allowances, according to Facebook.

“Videos will begin to play as they appear onscreen — without sound — similar to how they behave when shared by friends or verified pages,” Facebook said.

“If you don’t want to watch the video, you can simply scroll or swipe past it.”

The clips could last for up to 15 seconds, and an advertiser wanting to reach all Facebook users aged between 18 and 54 might have to pay $2 million per day.

"This news further confirms that Facebook has abandoned social marketing in favour of standard push-style ads," said Forrester analyst Nate Elliott.

"But if they’re choosing to be just another online ad seller, this is a good move. Marketers love video."

"We’ll be watching to see how far and how quickly Facebook pushes these ads," Elliott said.

"The company hasn’t always been smart about testing new ad formats and rolling them out slowly, but that’ll be important here to avoid compromising both the user experience and the video ads’ effectiveness.”

Facebook, which like all free sites draws most of its income from advertising, reported in October that ad revenue in the third quarter rose 66 per cent from a year earlier to $1.8 billion.

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