The document discusses the significant growth of digital advertising in the 2016 U.S. elections, with overall ad spend reaching $11.4 billion, and digital expenditures exceeding $1.1 billion. It highlights the advantages that Democrats hold in data collaboration compared to Republicans and the impact of various social media platforms on voter engagement and targeting strategies. Additionally, it notes the continued importance of traditional media, micro-targeting techniques, and the evolving role of data in campaign strategies.