Social analytics - one of the hot topics for social networking enthusiasts...
Four Ways of Looking at Twitter - Research - Harvard Business Review
Data visualization is cool. It's also becoming ever more useful, as the vibrant online community of data visualizers (programmers, designers, artists, and statisticians — sometimes all in one person) grows and the tools to execute their visions improve.
Clark's latest work shows much promise. He's built four engines that visualize that giant pile of data known as Twitter. All four basically search words used in tweets, then look for relationships to other words or to other Tweeters. They function in almost real time.