The document discusses how technology is changing the way people use devices. It notes that in 2011, 39% of devices on a university campus network were Macintosh computers, while 39% were Windows computers. However, by 2012 mobile devices such as smartphones and tablets had increased significantly, with Android and iPhone usage growing substantially. The document discusses how this represents a shift to a "post-PC" world where mobile devices are more prominent. It also examines challenges in predicting future technological developments and possibilities such as wearable computing and how libraries need to prepare for major changes in technology usage.