A video from a Coldplay concert has dominated internet discourse as it may have revealed an extramarital affair. After a giant screen in the stadium showed a couple embracing and then quickly breaking apart, the man in the video — who the internet quickly identified as the CEO of a tech company — has been placed on leave, a spokesman for the company said.

The internet’s latest obsession occurred at, of all places, a Coldplay concert in Foxborough, Mass.

During the concert on Wednesday night, Chris Martin, the band’s frontman, announced that he would be singing to a select few fans in the crowd. “The way we’re going to do that is using our cameras,” he said. “So, if you look at the screens, we’re going to come looking and see who’s out there to say hello to.”

After Mr. Martin sang a happy birthday song to one ecstatic fan while playing mellow guitar, a giant screen in the stadium showed a couple embracing.

The man, who the internet quickly identified as Andy Byron, the married chief executive of a tech company called Astronomer, held his arms around Kristin Cabot, the company’s chief people officer who is not his wife.