Facebook is testing video advertisements that automatically play in users’ news feeds, seeking to catch up with other websites offering short commercials online.

The first promotions are starting to run this week, the company said in a statement today. One of the first clips will be a trailer for the Lions Gate Entertainment Corp. ) film “Divergent,” video posted on Facebook’s website shows.

The world’s largest social-networking service plans to offer 15-second spots, two people familiar with the plans said in July. While the company already allows advertisers to upload videos to their Facebook page and then broadcast them to a user’s news feed, the new service would let marketers buy their way directly into a person’s feed, according to the people.

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