This document summarizes a panel presentation on using Tumblr in libraries. The panelists discussed how they started Tumblr accounts for their libraries to engage users in new ways. Examples included posting local news and tying historical facts to current events to attract interest. The panelists also highlighted strategies like spotlighting interns' work and partnering with researchers to share content. They found Tumblr allowed them to take a less formal approach than other social media and build audiences around timely topics.