Senh: There's something wrong with these charts. Shouldn't the week of the relaunch of Digg v4 show at least a slight increase in traffic? During the launch date, the news media and bloggers were writing about it, which should result in a traffic spike.
Senh: In terms of analysis, the article is similar to what I wrote. Mainly, Facebook, Twitter, and Yahoo Buzz got into link sharing and pretty much pushed Digg aside. Digg execs attributed the lost in traffic to Google's new algorithm which resulted in less referral traffic to Digg. The article also has an in-depth write-up of its history.