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When Mr. Trump posted an altered video of Speaker Nancy Pelosi, Facebook and Twitter refused to take the video down. A 30-second video ad on Facebook in October falsely accused former Vice President Joseph R. Biden Jr. of blackmailing Ukrainian officials to stop an investigation of his son.

Mr. Bloomberg, a latecomer to the race, has poured hundreds of millions of dollars into it. As the owner of Bloomberg L.P., he has the money and the resources to vastly outspend his rivals.

Mr. Bloomberg has reassigned his employees and recruited other workers from Silicon Valley with salaries nearly double what other campaigns have offered their staffs. The roughly $400 million he has spent has made him omnipresent in ads across Facebook and Instagram, as well as on more traditional forms of media such as television and radio.

His campaign’s sophisticated understanding of how to generate online buzz has shown how uneven social media’s new political speech rules can be.

Mr. Bloomberg’s lackluster performance in the Las Vegas debate — three days before Saturday’s Democratic caucuses in Nevada — was startling even to his supporters. But soon after, his campaign’s digital team edited the debate into digestible bites on social media that made Mr. Bloomberg appear as though he had done better. On Thursday morning, a video was posted to his Twitter account.

“I’m the only one here, I think, that’s ever started a business. Is that fair?” Mr. Bloomberg said in the clip, showing him up on the debate stage. The video then cut to reactions from the other candidates, who appeared speechless. Crickets chirped in the background as the silence stretched on for 20 seconds.

In reality, Mr. Bloomberg had paused for about a second before moving on.

“It’s tongue in cheek,” Galia Slayen, a Bloomberg campaign spokeswoman, said of the video, which was viewed nearly two million times within hours. “There were obviously no crickets on the stage.”