Okay, okay he didn't quit "This Is Us", but he DID quit Instagram!
“It started as a place [for] a collective group of photographers and artists to share their work, and their lives,” Ventimiglia told the Associated Press on Thursday, March 23. “And at a certain point — after doing it for three years — I saw it change.”
He added: "Nobody was looking at the photos. They were asking me about my acting jobs. And I kinda went, ‘Oh, man.’”