Instagram is exploring building a dedicated TV app as part of a deeper push into video, a move that could get Instagram videos in front of more viewers and also provide more competition for YouTube, which already makes it very easy to watch videos on a television.“If behavior [and] the consumption of these platforms is moving to TV, then we need to move to TV, too,” Instagram chief Adam Mosseri said Thursday at the Bloomberg Screentime conference in Los Angeles. He said the company is “exploring...