Digg made some radical changes that made most of their crowd leave. But digg is mostly for news stories, so if you had a writeup on your business and it became popular on digg, you could get a lot of views from that. But usually the articles that get the most exposure are dealing with current events. I can’t really see how you could effectively use it to generate buzz, that depends on having a big network there and having all of them digg your story and it being passed along that way.