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http://www.whatuseek.com/addurl.shtml
http://www.entireweb.com
http://www.linksviet.com/submit-link/
http://www.submitexpress.com/free-submission.html
http://www.cleversubmitter.com/
https://digg.com/tools/diggthis/confirm
http://www.w3catalog.com/submit.php