Anyone in the art market who was not already paying attention to the social media platform Instagram had to sit up and take notice in April after the actor Pierce Brosnan visited the showroom of Phillips auction house in London. Mr. Brosnan snapped a selfie in front of a work he admired: the “Lockheed Lounge,” a space-age aluminum chaise longue by the industrial designer Marc Newson. Then he added the words “let the bidding commence,” and posted it to the 164,000 followers of his Instagram feed.

And commence it did. Later that week, Phillips broke the world auction record for a design object, selling “Lockheed Lounge” for £2.4 million, or about $3.7 million.

“It’s hard to make a direct correlation between Pierce Instagramming us and the world record, but certainly it made the lounger more desirable,” Megan Newcome, Phillips’s director of digital strategy, said in a telephone interview. “Thanks, Pierce, for the shout-out.”