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Meta keywords have never hurt any of our customer sites and can only help with other less known search engines. So I disagree with most here and say "keep them!"

now i only do releated forums,blogs and coupon code websites. i also build internal links,some website owners will copy my content with the links, and the photos of product without watermark,some website owners will quote it directly on their blog posts or threads. but i think my link types not good enough,anyone have better idea?