In an increasingly digitally connected world, social networks have become a large factor in news consumption, discussion and staying connected to friends. This thesis aims to give an overview over how this new platform has been a vector for the conduction of disinformation campaigns. Beyond the prime example - possible Russian disinformation in the U.S. from 2015 to 2017 - and its efficacy, further candidates as well as the historical context, technical aspects and the public response are touched upon. The U.S. election of 2016 is evidently a well-documented example of an election targeted by a large-scale disinformation campaign conducted through social media. Indications exist that campaigns are also being conducted in other political contexts (France, 2017) and with contexts extending into economics. This thesis also finds that more research is needed to systematically detect and investigate disinformation campaigns, especially in order to measure and contain their real-world impact.