Supporting lots of standalone instances of WordPress can be a nightmare. Thankfully there is WordPress Multisite. But is it right for you? And what happens when your WordPress network explodes to include thousands of users and sites? At UNC-Chapel Hill our two WordPress multisite networks (self-serve/enterprise) power over 8,000 sites across a wide range of use cases. During this presentation we’ll primarily explore the technical aspects of running a WordPress multisite network, such as scalability, security, user experience, and administrative challenges. We’ll share tips, lessons learned, and ongoing challenges.