After learning that the suspect in the Uvalde school shooting posted about his intentions on Facebook, activists are urging social networks to make changes. Lena Derhally, a licensed psychotherapist and author of "The Facebook Narcissist," joined Cheddar News to discuss the role social media plays in school shootings. "They're not really invested in taking down hateful content," she said about social platforms."In regards to the shooting, it was 15 minutes before that actual threat. It would be pretty hard for a social media company to trace that threat that quickly. But what they can do better is take down threats and hateful content much faster and more than they're doing now."