1. Duplicate Content 15 april 2010, CAC Amsterdam 1

2. Duplicate content Duplicate content 2

3. Introductie 3 Mathieu Burgerhout Netsociety Webshoptimizer SEO consultant Technique Marketeer wordpress techno usability SEO apple geek Search Engines

4. Programme What is duplicate content? How to prevent duplicate content Canonical tag best practices Questions 4

5. What is duplicate content? Dictionary: {An identical copy} Google: {indicates identical or even similar content on different websites and results in penalties from search engines} 5

6. What is duplicate content? 6 www.seomoz.com

7. What is duplicate content? 7 www.seomoz.com

8. What is duplicate content? 8 www.seomoz.com

9. 9 What is duplicate content? www.seomoz.com

10. Supplemental results 10

11. Types of duplicate content 11 The Classic

12. Duplicate content 12

13. Duplicate content 13

14. Duplicate content: solution Permanent 301 redirect Non-www to www Trailing slash Index.php ↔ / Bi-languals Make the content differ Combine domains 14

15. Types of duplicate content 15 The Ugly

16. Duplicate content 16 That’s ugly!

17. Duplicate content 17 OMFG!!!

18. Duplicate content 18

19. Duplicate content: solution Canonical tag Point to the ‘clean’ URL Exclude filter/sort pages Robots.txt Meta noindex 19

20. Types of duplicate content 20 The Lazy

21. Duplicate content 21

22. Duplicate content Don’t copy/paste Make it unique Mash ups Reviews 302 redirect 22

23. Types of duplicate content 23 The Unavoidable

24. Duplicate content 24

25. Duplicate content 25

26. Duplicate content: solution Enough content Overrule footer/menu with… content 26

27. Canonical tag 27 Poor man’s 301

28. Canonical tag does… Only redirect search engines Is an “alternative” for a 301 Can be used cross domain 28

29. Canonical tag does not… Redirect visitors Work instantly Solve your problems (i.e. get your site right) 29

30. Identifying canonicalization 30

32. mathieu@webshoptimizer.nl

33. www.webshoptimizer.com

34. http://twitter.com/MathieuSEO

35. http://linkedin.com/in/zoekmachinespecialist

36. http://www.slideshare.com/webshoptimizer