These sites give a value of your URLs and also provide a free link back to your site.
We sends your URLs to over 15,000 sites which gives you that many one way backlinks
and Rapidly gets your URLs indexed by Google!
then we ping all of these links to notifies Search Engines that it has been updated.
I will provide you with a screen shot using Scrapbox Rapid indexer
NOTE: that this is Rapidly submitted not all websites will have direct backlink to your website,
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submit Your website to 15,000 sites for Backlink