The internet will be a thriving, low-cost network of billions of devices by 2020, says a major survey of leading technology thinkers.
The Pew report on the future internet surveyed 742 experts in the fields of computing, politics and business.
More than half of respondents had a positive vision of the net's future but 46% had serious reservations.
Almost 60% said that a counter culture of Luddites would emerge, some resorting to violence.
The Pew Internet and American Life report canvassed opinions from the experts on seven broad scenarios about the future internet, based on developments in the technology in recent years.