By Scarlett O’Toole & Natalie Hunter Meghan Markle gave a passionate speech at the SXSW festival as she opened up about how social media can be a “dangerous” place for young girls. The Duchess of Sussex appeared alongside journalist Katie Couric, actress Brooke Shields and diversity equity and inclusion consultant at Peoplism, Nancy Wang Yuen. Errin Haines, host of The Amendment podcast, moderated the session. Speaking on International Women’s Day, Meghan talked about how social media is creating an “often dangerous environment” which has led to serious mental health issues for teenage girls i…