Neither is automated, but Social Bookmarking 101 is the most interesting in my opinion. A great concept.
Essentially, you bookmark other peoples URL's and they bookmark yours. You send in your URL, desired tags and descriptions (various ones to keep it natural) and it gets sent out to 10 other members Monday, Wednesday and Friday. They bookmark your stuff for you. And, you recieve 10 links to bookmark Monday Wednesday and Friday.
It looks natural because it essentially is natural.
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