First, don't panic. This is a serious problem but you need to put it into perspective. While there is clearly a vulnerability, there are so far no reports of the flaw being exploited. And even though this flaw has been around for the past two years, almost all the major sites have fixed it -- in some cases, in the last few days.
The idea of a contract, or series of pledges, is to get everyone in the family on board as to what it means to use today's technologies safely and smartly. This includes understanding privacy, security and maintaining your reputation as well as some basic pointers about making sure you stay safe online.