Wikipedia:Wikipedia Signpost/2013-05-13
- News and notes: WMF–community ruckus on Wikimedia mailing list
- WikiProject report: Knock Out: WikiProject Mixed Martial Arts
- Featured content: A mushroom, a motorway, a Munich gallery, and a map
- In the media: PR firm accused of editing Wikipedia for government clients; can Wikipedia predict the stock market?
- Arbitration report: Race and politics opened; three open cases