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I am trying to submit an URL to Digg, but get Invalid URL:
What's the problem?
Add index.html1 to the end of your URL and then Digg should accept your submission, it worked for me.
1 or index.htm, or index.asp, or default.htm, or whatever the webserver uses for the default document
The problem is that Digg does not accept server-only URLs.
The unit at Digg is stories, not websites.
They have a filter that tries to detect whether an URL is a story or not.
So instead of server.com, I submitted server.com/article.html and it worked: