Maybe I'm the only one, but I moved from digg to reddit entirely because digg was blocked at work and reddit wasn't. I've worked at four different places in the last five years and at each one I expect to see reddit blocked as well, but no one has gotten around to it. Maybe my situation is atypical, but I have to believe that the lack of availability of digg to office-bound slackers had to have played some part in it's demise.