In her second day on the stand of a landmark antitrust trial over Meta’s power, Ms. Sandberg, the former chief operating officer, also said the company faced plenty of competition from TikTok.

© Jose Luis Magana/Associated Press

It was the second time in a year that a U.S. court found that the company had acted illegally to remain dominant.

© Pete Marovich for The New York Times

The Meta chief executive testified in a landmark antitrust trial that it was business as usual when he bought rival apps. He denied he was trying to snuff out competitors.

© Tom Brenner for The New York Times