Networks (Network Theory)
If you've been involved in web design for any length of time then you'll have come across Jakob Nielsen; I still treasure my 1999 copy of 'Web Usability' because it takes a scientific approach to web design - making web pages intuitively easy to use. A decade on and Nielsen's work has grown into a substantial and significant web usability consultancy.
'Netiquette' embraces all the behaviours and misbehaviours that have arisen as a result of paramount connectedness on the Web; what we see and do reflects human society on a global scale. Spam, porn, hacking, flash mobs, freedom of speech, libel, privacy ...
Network Theory embraces many aspects of understanding who we are and how we behave in a way that can exploit the 'Big Data' offered in the 21st century. It is a smarter way to study what is going on in our heads, in society and online.