It's easy to inadvertently reveal personal information to the entire internet using email. Claire Swire, Peter Chung, Trevor Luxton and countless others can vouch for this. The point-to-point nature of mail communication (and text messaging for that matter) gives an unfortunate illusion of privacy, yet publication and mass replication are only a couple of clicks away.

Posting on openly public sites such as Twitter and Facebook actually forces a lot more careful consideration up front. The sober reality is that you and your children should be treating the private emails you send in the same manner.