The more directories your site is listed in, the more inbound links your site will be seen as having, which in turn will improve your link popularity. Link popularity isn't the only thing to consider for SEO.
You need to find links from Add Site directories or Submit URL or Link Directories. This is pretty easy to do, however you must know how to search to find them.
There are many softwares which offers to submit your site automatically. This easy way is not recommended. Submitting your site automatically, may cause a duplicated advertisement..
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