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I've recently built an ecommerce site which I would like to promote. I've heard about link building and I'm unsure of wbere to start. I've signed up to two-three forums which have content related to my site and made posts with my site url as my signature. I have a few questions about it...

Hello to everyone, Up until now, there have been many discussions and proposals for promoting the sites with different search engines like Google, Yahoo , etc ... Are there any means to eliminate or downgrade a site from a superior position from Google ? what about Yahoo ?! ~~~~~~~