As I recall the original conception of the web was such that it was inherently browsable _and_ editable (the first web browser was also a WYSIWYG editor). After people forgot about this and subsequently rediscovered an easier form of publishing user-generated content via web apps (PHP) "Web 2.0" took off. Ever since then I've used "Web 3.0" as a casual tongue-in-cheek reference to emerging web technologies and concepts; I never thought I'd see it seriously applied to technologies like blockchain and asymmetric key cryptography.