In my Digital Citizenship classes I have been holding in our 7th and 8th grade classes, I talk about the dynamic of meeting strangers on the street and meeting strangers online. When we grow up, we are taught not to talk to strangers. Parents know that there are malicious people out there and they want to protect their children. My daughter is very much a social butterfly, and we have to instill in her not to talk to strangers.
In my classes, we discuss how the rules change when meeting strangers online. The average part of an online lifestyle is meeting strangers. It is one of the best parts of being online. Sharing, collaborating, strategizing, meeting, communicating, learning - many careers require the ability to do this with strangers online; and students can learn a lot from strangers online.
The main element I try to capture with the students is that meeting strangers online can be a great opportunity, however we have to learn when the relationship (and I do not mean romantic relationship, but any kind of communication or transaction with a stranger is referred to as a relationship in the class) gets uncomfortable, or private information is being asked for, then red flags should go up and we should reconsider the value of the relationship. I teach students how to deal with situations like this - logging off, leaving the conversation, changing the subject, not revealing your real name, and especially not giving out personal information.