“Social media is a canvas for me,” the actor Jim Carrey said on Sunday at Hollywood’s Roosevelt Hotel, during a talk with art critic Jerry Saltz. About a third of the way into their hour-long conversation, Carrey picked up his phone and placed a call to his assistant, requesting an update to his Twitter account. “Hey man,” Carrey said on speakerphone. “Fill the torpedo tube.” “Torpedo tube’s loaded,” the assistant said. “Fire!” And then, just like that, Republican Senator Mitch McConnell’s face appeared on Twitter, rendered in felt-tip marker atop the body of a sea turtle.