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May 31 2010

Official Google Webmaster Central Blog: Reunifying duplicate content on your website

Handling duplicate content within your own website can be a big challenge. Websites grow; features get added, changed and removed; content comes—content goes. Over time, many websites collect systematic cruft in the form of multiple URLs that return the same contents. Having duplicate content on your website is generally not problematic, though it can make it harder for search engines to crawl and index the content. Also, PageRank and similar information found via incoming links can get diffused across pages we aren't currently recognizing as duplicates, potentially making your preferred version of the page rank lower in Google.