From UC-Irvine professor Mark Warschauer, "The Death of Cyberspace and the Rebirth of CALL:"
The notion of "cyberspace" suggests that there exists a virtual, online world that is distinct from our real world. "Cyberspace" is a type of fantasyland, where we take on cyber-identities and engage in virtual reality. But then, when we leave cyberspace, we come back to the "real world".
I would contend, in contrast, that the significance of online communication lies not in its separation from the real world, but rather in how it is impacting nearly every single aspect of the real world. Just like there is no such thing as "speechspace" or "writingspace" or "printspace," so there is no cyberspace. The notion of cyberspace is thus not helpful for understanding the very real impact of online networking on our lives, and indeed the concept of cyberspace is slowly dying out.