Being safe online is your responsibility! When you are online you must think about the information that you are sharing and how it may fall into the wrong hands or even be used against you. This is the advice that I give both my students and my children.
Most recently, my family was all at a theme park for the day and my daughter used a popular feature on social media called "Check-In". Although she thought it was fun, she just told the world that we weren't home and where she would be for the day. Yikes!!! My recommendation was that if she wanted to share with some close friends what she was going to do for the day, that she do just that. Send a personalized email or make a phone call. Sending a blanket post to all to view might just be dangerous and both children and teens need to be informed.
Without sounding preechy... it is difficult for parents who aren't familiar with the features of social media to provide advice to their children. So, develop a relationship with your child and ask him/her to show you the features of whatever social media format that he/she likes to use and make good family decisions about what should be limited.