Share 'Stumble and Digg question'

Since I am new to Stumble and Digg I have a question about how this works. People send a Digg or Stumble request through this site and they put their blog posting directly. When I have tried to digg or stumble from the blog I sometimes get a message like "this url has been spamming our submission software" The only thing I can figure is that people are submitting the blog posts individually. Wo...