Funding Source: National Science Foundation, Brachman-Hoffman Grant, Wellesley College – The fact that online social networks play a significant role in our perception of reality is relatively new and well documented. Along with Search Engines, they are our principal source of information on a daily basis. In the last decade, we have been researching many aspects related to the propagation of information and misinformation, the prediction of political events, and have developed tools that help users evaluate the trustworthiness of information. In particular, research in my lab has documented the shifting ways that students rely on the Web for information; the efforts of individuals, groups, and companies manipulate the ranking of search query results; the first Twitter Bomb, Google bombs; the evolution of the “fake news” phenomenon; and other examples of online propaganda using algorithmic techniques. We have also analyzed the reasons behind the unpredictability of electoral results based solely on data from online social networks.