Computer Science vs IT vs Digital Literacy
When we were drafting the English national curriculum, we found it easier to think in terms of the foundations, applications and implications of computing, all three of which really should be included in any broad and balanced approach to the subject. You can map these to computer science, IT and digital literacy if you wish, although you would need to accept a rather broader definition of digital literacy than that used by the Royal Society 

Foundations would be about the underpinning principles of computer science (logic, algorithms, data representation, abstraction), as well as their practical expression through programming and more generally in computational thinking.

Applications is about skills in using digital technology to get useful work done, including collecting, managing, analysing and communicating data and information and creative work in a range of digital media.

Implications is about a critical understanding of the impact of digital technology on individuals and society as well safe, responsible and ethical use. I'd include intellectual property, privacy and security here too.

I've an illustration of all three in response to the question 'How does Google work?' 

Foundations: big data, Page Rank, Big Table / the Google File System (GFS) etc

Applications: type your query, click the button (well, these days it starts searching as you type), but also filtering results, advanced queries etc

Implications: profile, filter bubbles, advertising, smart creatives, separating costs and revenues for accounting purposes etc