In Digg Swarm circles are drawn for stories as they're dugg. Diggers swarm around stories, and make them grow. Brightly colored stories have more diggs. The visualization has three modes: all activity, popular, and newly submitted stories.
visualcomplexity.com | Digg Labs: Arc In this particular execution, Digg Arc displays stories, topics, and containers wrapped around a sphere. Arcs trail people as they Digg stories across topics. Stories with more Diggs make thicker arcs.