1. The document discusses using social media data and metadata for data visualization and analysis to identify patterns in public communication and cultural participation. 2. It provides examples of visualizations of individual Twitter user statistics, Twitter friend networks, the perspective of news sources like The Australian and The Sun based on blog data, and the geographic distribution of Last.fm users. 3. The document suggests that while there is currently more social media data than research ideas, data can be used to examine the diffusion of ideas, the spread of information across networks, and interconnections between different media through combined analysis and visualization.