While either point can be argued (that the internet is not an interface or that the WWW is not an interface), sometimes what is considered an interface may be subjective. In the particular definition which I have supplied in the last post, an interface can be anything that communicates between a sender and a receptor. Interfaces have, for a long time, been defined also by the criteria that one must be able to visually see or interact with it; this, however, is not the full definition of an interface. An interface may exist connecting, in the case of the internet and the World Wide Web, digital information between two computers, or from a server to a browser.
The different computers, browsers, etcetera then may change from a receptor to an interface to communicate the digital information to a new receptor (usually at this point a person).

Computers could not transmit or receive this information without some kind of interface, whether that interface is the Internet, World Wide Web, a WiFi network, or even as simple as a FireWire port – there still must be some kind of interface to “bridge the gap”, so to speak.

This is definitely a subjective discussion – my goal here is to incite not only extended discussion, but also to introduce the concepts of what an interface could be, and why. Thanks, Tyler, for your question!