It is noteworthy that professional/corporate creators haven't followed the hobbyists and kids into some of these spaces to represent their brands as much as they did into the land of Web+Flash. I don't see how that matters when measuring the "Internet's Most creative Era."
Consumers are more savvy, and brands are have gained some wisdom to not step on territory that makes them appear inauthentic and creepy. Second Life was an interesting experiment, but I'm happy that big brands haven't made ads in Roblox yet.