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Yes, I know how each one of those methods work.  What I was getting at was the fact that the links are all essentially the same in that they are generally on low quality pages and the end result is proliferating duplicate content throughout the web.  The Autoblogging tools I'm familiar with utilize RSS feeds or other data feeds (that someone else has "syndicated") to publish content. I suppose syndicating content would be effective if you're content is great and you are a well known blogger, like Rand!