WaPo:

Social media sites are once again at the center of a debate over online speech after Twitter applied its new “manipulated media” label for the first time yesterday to a deceptively edited video of former vice president Joe Biden. 

White House social media director Dan Scavino posted the video, and it was later retweeted by President Trump. Scavino also shared the same video on Facebook. This morning, the company labeled it to reflect that independent fact-checkers found the altered video contained “partly false information,” and Facebook is “reducing its distribution,” according to company spokeswoman Brittany Uter.