eMarketer (Insider Intelligence) provides extensive information on digital marketing, media and commerce topics, organized by topic and/or geographical area. Use the Comparative Estimates section to view estimates and forecasts from over 4,000 research firms, consultancies, government agencies and universities around the world across a range of media usage, advertising spending and ecommerce categories, and/or view eMarketer's own proprietary data. Use the Browse feature to gain access to in-depth reports, articles, charts, interviews and webinars on a variety of subtopics. Charts and graphs are available in PDF, JPG and XLS formats for inclusion in presentations and reports.
The term "marketing to generation z" works well for finding research on this demographic. Note: eMarketer is an international database, be sure to use the limiters on the left-hand side of the results page to select the United States.