I thought the following so worthwhile that I am repeating it:
Consider these questions, compiled by the organisers of Safety Internet Day, before your next posting, and if you're a parent, ask your children these questions to help them learn about responsible posting:
Are you using the privacy settings offered by social networking services? On Facebook, you can always adjust them on the Privacy Settings page.
Are you selecting friends online that you can trust? Remember it's not just about what you post, but how others may use that content.
Are you carefully thinking about the potential consequences of publishing your photos before you upload them?
Do you ask for permission from your friends before publishing photos of them? A photo that may be funny to you may cause harm for a friend.
"Think Before You Post" is a positive message. It is about taking control of your online safety and participating in the benefits of social media, with respect for yourself and for others.