1. Wikipedia – The Free Encyclopedia Petr Kadlec http://cs.wikipedia.org/wiki/User:Mormegil 16th Annual Conference of EINIRAS, 25/09/2006

2. 2 / 20 What is Wikipedia? Freely licensed encyclopedia Available in more than 100 languages –Czech (cs), English (en), de, fr, … Written by volunteers The English edition started 15/01/2001 http://www.wikipedia.org/

3. 3 / 20 Reading Wikipedia

4. 4 / 20 Editing Wikipedia

5. 5 / 20 How a wiki works Every page contains an “edit” link Simple formatting syntax (wikicode) –'''bold''', ''italic'', [[link]] etc. Page history: revisions, authors, diffs Recent changes, watched pages Categories, what links here, …

6. 6 / 20 Edit history

7. 7 / 20 Examining differences (“diff”)

8. 8 / 20 Community, rules A community of users (“wikipedians”) –Anarchy, democracy, meritocracy, … Various forms of communication –Talk page next to each article –Project pages, Village Pump –E-mailing users –IRC channels, mailing lists

9. 9 / 20 Rules Basic rules –Neutral Point of View (NPOV) –No original research –Verifiability –Free content (GNU FDL)

10. 10 / 20 Sysops, fighting vandalism There are many fools on the Internet… “Soft security” Easily reverting changes through history Sysops –No power, only technical measures –Deleting pages, blocking vandals, protecting pages, simplified reverting

11. 11 / 20 Problems Vandalism –Not a critical problem Human conflicts, trolls, flamewars, … POV pushers –Bit of a problem

12. 12 / 20 Quality and trustworthiness Infinite monkey theorem? Without credible authors of content?  rules for verifiability etc. Warning templates Systemic error The articles are written by young, technically apt people from the West

13. 13 / 20 Quality surveys c’T (2004): Wikipedia gegen Brockhaus und Encarta –Wikipedia 3.8 pts, both remaining 3.6 pts. Nature (2005): Internet encyclopaedias go head to head –Considering number of errors, Wikipedia is worse than Encyclopaedia Britannica only by a small margin –(EB disagreed)

14. 14 / 20 Growth rate

15. 15 / 20 Czech Wikipedia growth rate

16. 16 / 20 Popularity increase

17. 17 / 20 Growth rate, financing Exponential growth Only voluntary donations, sponsoring, grants etc. Absolutely no advertising at the moment 2005 budget: $739,200 …and much more this year…

18. 18 / 20 Software & hardware MediaWiki (http://www.mediawiki.org) GNU GPL Linux, PHP, MySQL, Apache, Squid Clusters, over 100 servers around globe Currently peeks about 20 K HTTP req/s

19. 19 / 20 Organization, other projects Wikimedia Foundation Other projects –Commons (http://commons.wikimedia.org) –Wiktionary (http://www.wiktionary.org) –Wikiquote (http://www.wikiquote.org) –Wikinews (http://www.wikinews.org) –Wikibooks, Wikisource, Wikispecies

20. “We make the Internet not suck” – Jimmy Wales Thank you for your attention Contact: http://cs.wikipedia.org/ Petr Kadlec