Aluminium or Aluminum? Should a photo of a giant spider be placed in the entry for arachnophobia? Are Anakin Skywalker and Darth Vader considered the same character? What does "pwned" mean? These are the questions which began some of the greatest edit wars on Wikipedia.
Click on the image for a closer look.
The numbers on the illustration indicate how many edits a particular dispute caused on the corresponding Wikipedia entry while the colours indicate the category a disagreement falls into.
Illustration used with permission from Information is Beautiful, a great source of data visualisations.