Digital literacy?

I have been reading articles about digital literacy. The more I read, the more I am not sure what is the definition. But one thing for sure is that, the term "digital literacy" assocaites to many :literacies":

• Media aliteracy
• Web literacy
• ICT (Information and Communicatin technology) literacy
• Network literacy
• Computer literacy
• Electronic literacy

I guess it depends on which areas you emphasize on.