It's on there forever and can be used to trace back to you at any time. Keep track of who you interact with on the internet. Some people may not be who they seem to be. Know that privacy is just an illusion. Even personal information on social networks can be easily recovered by anyone.
"Literature Survey
The Importance of Community to Learning
The concept of learning communities has been discussed for more than two decades (Caverly & McDonald, 2002). Research has clearly shown that functioning in a community can enhance the learning that occurs among community members (Hargis, 2005; Kember, 1987; Powers & Mitchell, 1997). While community has been defined in the education literature in many different ways (Boyer, 1995; Hill, 1996; McMillan & Chavis, 1986; Preece, 2000; Rogoff, 1994; Sergiovanni, 1994), below are elements of community frequently identified:
1) A sense of shared purpose
2) Establishment of boundaries defining who is a member and who is not
3) Establishment and enforcement of rules/policies regarding community behavior
4) Interaction among members, and
5) A level of trust, respect and support among community members"
Excellent resource - has an interactive story called the Inter-Yeti. Has valuable information for parents and educators about different topics such as cyber bullying, pornography, online grooming etc. Has a section for youth with links to a series about online safety.