Digg v4 is finally live. The web bookmarking service has gone very social in its latest turn, but along with the functionality changes come a slew of interface changes. The cleaner UI leaves a lot more room for reading and a lot less clutter, while the colors have switched to a simplistic blue and white. My gut reaction is that this is in response to the growing power of Reddit, and also the re-crowning of Kevin Rose as CEO. Read more about the changes below.