What are definitions of liability and reliability for an information systems professional?

What does “security” denote and connote?
Why is security such a big deal?
What are definitions of liability and reliability for an information systems professional?
What is the global aspect of this topic? What is the economic aspect of the topic? What is the social aspect of this topic? What is the ethical aspect of information security?

What is the global aspect of social media as issues for an organization?
What is the economic aspect of social media as issues for an organization?
What is the social aspect of social media as issues for an organization?
What is the ethical aspect of social media as issues for an organization?