Multi-Platform News Use and Political Participation Across Age Groups: Toward a Valid Metric of Platform Diversity and Its Effects

News consumption in today's media environment is increasingly characterized by reliance on multiple platforms: People now get their news from the web, television, radio, and various social media. Employing a nationally representative survey from the United States, this study develops an index of multi-platform news use. The index is validated by testing age group differences in the way people participate in politics. Results show that Millennials are more likely to rely on multiple platforms for news. Multi-platform news is also positively related to alternative modes of political engagement. Results are discussed in light of generational shifts in political behavior.