According to my opinion it is a mixed idea. I mean if you want to promote your site with all of your skills I won't recommend you to use those sites. It looks like as a shouting for search engines come here index me! I think this isn't the natural way to get indexed. But if you have a traditional business and all you want to is to be available on the Internet, I guess you won't worry about SERP and PR so it's supposed to be an ideal way to get into the index.
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