The columns each have their own color and sorting method. Users who appear in more than one column use their first color assigned, allowing for easy tracking between columns.
The colors are gradiented from full R/G/B at the high-end to white-faded at the low-end. The leftmost column uses Red and is a pure url-count ranking; the score is number of urls in common
(thus you can tell what the sample size was the score of the user themselves at the top). The middle column uses Green and sorts by the weighted reverse ranking from Figure 02.03. The
rightmost column uses Blue and its filtering mechanism rewards high correlation on the more random links that were shared.