Get to know the apps and services children are using. Ask them what apps they use, what they like about them and how they protect themselves when using those apps. You might be surprised to find out that they are knowledgeable and responsible about their use of the apps. Whatever you do, I think it is best to make it a conversation, not a lecture or an inquisition. It doesn’t have to be long or deep but you should revisit the conversation from time to time.