https://about.fb.com/news/2013/12/testing-a-new-way-to-watch-promoted-videos-in-news-feed/
Testing a New Way to Watch Promoted Videos in News Feed
Nov 7, 2019 - We're beginning to test a video viewing format for advertisers that will improve the quality of ads that you see in News Feed.
a new way to watchpromoted videosin newstesting