The document summarizes key technologies of 2021 and the theories related to their adoption. It discusses how the internet has evolved to include FACT-checked information on FIT networks. It also describes how social networking sites are now used by professors to share course content, and how critical mass theory and other theories explain their adoption. New smart phones all include advanced features, while older technologies like home phones are less common. Social learning theory and the theory of the long tail help explain trends in phone adoption.