Web 2.0; The potential of social media; The potential of wikis; Relevant security threats; Social media sites; Social engineering; Web applications within social media sites; Security controls applied to the participation-collaboration pattern; Types of security control; Stages in deciding on security controls; Who is involved in security? Acceptable use practices; Reasons for acceptable use policies; Content of acceptable use policies; Acceptable use policies for citizens; Acceptable use policies for public service employees; Parental participation-collaboration in schools; Security controls; Governmental involvement.