we have profiled many families who lost children who bought a counterfeit pill they bought through social media >> there are social media apps that intentionally make it so that the information so someone creates a story on snapchat, that's a 24-hour story. >> reporter: that's why the kids like it. >> yes. and it's also why the drug traffickers like it. >> reporter: should social media companies be doing more to help you? >> yes there is no question in my mind that social media companies are not doing enough to stop this problem. >> reporter: her critique as social media companies come under increasing scrutiny for failing to protect younger users. in an exclusive interview today, the head of instagram announced they're pausing plans to create an app geared towards tweens "the wall street journal" recently reported on internal research showing the app may be harmful to the health of teenage girls. >> if anybody leaves using instagram feeling worse about themselves, that's an important issue we need to take seriously. >> reporter: snapchat said we