These networks visualize the way in which memes about Fukushima's earthquake propagate among blogs (in red) and mainstream media sites (in blue) at three different points in time (March 18, 2011; June 25, 2011; and October 13, 2011), as inferred by InfoPath. Infopath is a network inference algorithm that infers "who-copies- from-whom" from massive crawls of the Web. The inferred networks give insights about the position and roles various sites play in the spread of ideas over the Web as well as helping us understand how information pathways change over time. Infopath was developed by researchers at Stanford University and Max Planck Institute for Intellingent Systems. Learn more about it at http://snap.stanford.edu/infopath.