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getting_rid_of_duplicate_content_iss-ben_dangelo.ppt

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Transcript

  • 1. Getting Rid of Duplicate Content Issues Once and For All PubCon, Las Vegas November 13, 2008 Ben D’Angelo Software Engineer
  • 2. What are “duplicate content issues”?
      • Multiple disjoint situations!
      • Duplicate content within your site or sites
        • Multiple URLs pointing to the same page, similar pages
        • Different countries (same language)
      • Duplicate content across other sites
        • Syndicated content
        • Scraped content
  • 3. Guiding principle
      • One URL for one piece of content
      • Why?
      • Users don’t like duplicates in results
      • Saves resources in our index—more room for other pages from your site!
      • Saves resources on your server
  • 4. Sources of duplicates within your sites
      • Multiple URLs pointing to the same page
        • www vs non-www
        • Session ids, URL parameters
        • Printable versions of pages
        • CNAMEs
      • Similar content on different pages
      • Manufacturer’s databases
      • Different countries
  • 5.
      • Many systems for de-duping URLs at various stages in our crawl/index pipeline
        • General idea: cluster pages, choose the “best” representative
      • Different filters are used for different types of duplicate content
      • Goal: serve one version of the content in search results
      • Generally just a filter: it will not destroy your site
    How does Google handle this?
  • 6. What can you do about your site?
      • For exact dupes: 301
        • Tracking URLs
        • www vs non-www (also Google Webmaster Tools)
      • Near duplicates: noindex / robots.txt
        • Printable pages
        • Clones of other sites
      • Domains by country
        • Different languages is not duplicate content
        • Use unique content specific to the country
        • Use different TLDs (also Google Webmaster Tools) for geo-targeting
      • Url parameters
        • Put data which does not affect the substance of a page in a cookie
  • 7. What can you do about your site? Choose www or non-www as preferred
  • 8. What can you do about your site?
  • 9. What can you do about another site?
      • Include original absolute URL in syndicated content
      • Syndicate different content
      • If you use syndicated content, manage your expectations
      • Don’t worry about scrapers or proxies too much; they generally don’t affect your rankings
        • If you are concerned, file a
          • DMCA request ( http://www.google.com/dmca.html )
          • Spam report ( https://www.google.com/webmasters/tools/spamreport )
  • 10. Best practices for Google
      • Avoid duplicate URLs / sites
      • Generate unique, compelling content for users
      • Don’t be overly concerned with duplicate content
      • Let us know about any issues at the Webmaster Help Forum
  • 11. Useful links
    • Webmaster Central  http://google.com/webmasters/
      • Webmaster Central Blog
        • http://googlewebmastercentral.blogspot.com/
      • Webmaster Help Center
        • http://www.google.com/support/webmasters/
      • Webmaster Discussion Group
        • http://groups.google.com/group/Google_Webmaster_Help
  • 12. Thank You!