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The campaign referred questions about the origin of the video to the White House, which did not respond to a request for comment.

The video isn’t legally actionable and shouldn’t be taken down, said Jonathan L. Zittrain, a Harvard Law School professor and a founder of the Berkman Klein Center for Internet & Society. But, he said, Facebook and Twitter should probably label the video.

“It’s important for social media sites that have massive reach to make and enforce policies concerning manipulated content, rather than abdicating all responsibility,” Professor Zittrain said.

Labeling is helpful, he added, because “even something that to most people clearly appears to be satire can be taken seriously by others.”

Of course, deceptive political ads aren’t a tool exclusive to the internet age, Kathleen Hall Jamieson, director of the Annenberg Public Policy Center at the University of Pennsylvania, said.

In 1968, Richard M. Nixon’s presidential campaign created an ad showing his opponent, Hubert Humphrey, addressing the Democratic National Convention interspersed with scenes of fighting in Vietnam, demonstrators being beaten in the streets of Chicago and poverty in Appalachia, she said.

In another ad, from 1960, John F. Kennedy’s presidential campaign edited clips of Mr. Nixon to show him sweating, appearing distracted and nodding and seeming to agree with Mr. Kennedy while Mr. Kennedy was speaking, Professor Jamieson said.