Web 1.0 referred to the early internet as a read-only system where users primarily consumed information. Web 2.0 emerged with the development of sites that encourage user participation and the addition of user-generated content through features like commenting and sharing. These sites have an "architecture of participation" that allows users to add value as they use the application. Web 2.0 also saw the rise of open collaboration on a global scale through platforms that enable mass participation from large numbers of people across borders and disciplines.