URL Tracking
Duplicate content – search engines sometimes have difficulty determining if two URLs contain the exact same page (see canonicalization for more information). In this case, we’re creating this problem because we’ve created multiple URLs for the same page. Search engines are likely to find all three URLs for the home page and store/ rank them as separate content within their index. This could cause the search engine robots to crawl the page three times instead of just once (which may not be a big deal if we are only tracking two promotions, but could become a big problem if we used similar tracking parameters for many other campaigns and URLs). Not only are the robots using more bandwidth than is necessary, but since they don’t crawl a site infinitely, they could spend all the allotted time crawling duplicate pages and never get to some of the good unique pages on the site.
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