Applied social network analysis
With Applied social network analysis, Jon Udell describes a fascinating approach to extract useful information out of such things as Amazon's "People who bought this also bought ..." as well as e-mail messages.
This is a single archived entry from Stefan Tilkov’s blog. For more up-to-date content, check out my author page at INNOQ, which has more information about me and also contains a list of published talks, podcasts, and articles. Or you can check out the full archive.