I did it for a couple days. Probably not worth the effort because you have to spin the title, description and tags. Basically write 5 versions of each. The report you get only shows half the sites submitted to. It's basically a giant upsell trying to get you to go premium, and the sites you do see your link submitted to are all the same site on different domains with keyword names like beatanxietyanddepression.com which probably has nothing to do with the link you're submitting. I didn't check if they were actually on different class C's but I doubt it.
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