Hardly a day goes by that you can't log into one of those services and see your "friends" talking about airport delays, creating their own vacation trip hashtags or Instagramming pictures of where they are -- thereby letting the world at large know where they aren't. And if adults can't resist, you know teenagers can't.
Most kids don't tell their parents about bullying. Maybe its due to feeling embarrassed or defenseless, or feeling that nothing can be done, or feeling that they will get in trouble for telling their story. For these reasons and more, parents need to maintain open lines of communication with their child.