Digg Labs Swarm is a visualization that displays the most popular/most frequently viewed news articles on digg.com and shows how readers connect from one article to the next. A screen shot of the website can be seen below:

The visualization relates to our discussion in class about triadic closure - a property that is satisfied when A has a strong connection to both B & C, and B & C have at least a weak connection between them. In a similar sense, digg users read different articles and are more inclined to visit other articles that are linked together. The size of the nodes indicate the popularity of the article based on which how many diggers read the story. Also, certain diggers have more clout than others depending on who their friends are in the digg network. This is somewhat related to our discussion in class about PageRanking - the more reputable a hub is (the more connections it has to the most popular results), the more inclined you are to trust that hub to give you what you want. In this case, the better connected digg users are the hubs that point to stories of interest to you. The more hubs that point to a particular story become the most popular and most viewed (i.e. the largest node).