Two Step Flow theory proposes that information from mass media does not directly influence the general public, but rather passes through "opinion leaders" who then communicate it to their followers. Paul Lazarsfeld and colleagues discovered this pattern in 1940s elections, finding that voters were more influenced by the opinions of community leaders than political ads and speeches. The theory provides a more nuanced model than the "hypodermic needle" view of direct media effects, and was effectively used in Nazi Germany where Goebbels served as an opinion leader disseminating Hitler's propaganda messages.