He introduced the collective intelligence concept in his 1994 book L'intelligence collective: Pour une anthropologie du cyberspace (Collective Intelligence: Mankind's Emerging World in Cyberspace).
Lévy's 1995 book, Qu'est-ce que le virtuel? (translated as Becoming Virtual: Reality in the Digital Age) develops philosopher Gilles Deleuze's conception of "the virtual" as a dimension of reality that subsists with the actual but is irreducible to it. In 2001, he wrote the book Cyberculture.
(wikipedia)