KANSAS CITY, Mo. -- It’s been just over a month since 13-year-old Nicole Lovell was murdered in Blacksburg, Virginia by a college freshman she met on social media. Some see it as a cautionary tale about what can happen younger teens online. Working with the new wave of sexually-aware middle schoolers, Dr. Wes Crenshaw sees both the negative and positive sides of how younger teens are using social media. Watch the video above for his list of tips to help keep your children safe.