Let say I want to get more backlinks from the same site I can't just use my primary domain in all my links since it will look spammy so you go to shortening url services and rewrite the URL so that it have different URL but still points to the same domain now you get post as many links as you can.
Many web directory won't allow you to submit the same URL more than once no problem you can bypass that with URL Shortener.
Try: Google URL Shortener
Check this out: http://letsforum.com becomes http://goo.gl/KLnl63
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