[SkinnerW]

This is from Digg TOS:

...with the intention of artificially inflating or altering the 'digg count', blog count, comments, or any other Digg service, including by way of creating separate user accounts for the purpose of artificially altering Digg's services; giving or receiving money or other remuneration in exchange for votes; or participating in any other organized effort that in any way artificially alters the results of Digg's services;

to create or submit unwanted email ("Spam") to any other Digg users or any URL;

I don't think "similar" stories are the problem - if this is an area that interest you, you want to talk about it.