I heard on NPR that there's a great site http://wikiscanner.virgil.gr/ created by a CIT grad student, Virgil Griffith, which allows you to see who made changes to Wikipedia articles and what changes have been made.
For example (from the article)
A person from Wal-Mart made this change:
Original:
Wages at Wal-Mart are about 20% less than at other retail stores. Founder Sam Walton once argued that his company should be exempt from the minimum wage.
New:
The average wage at Wal-Mart is almost double the federal minimum wage (Wal-Mart). However, founder Sam Walton once argued that his company should be exempt from the minimum wage.
I'm going to go check out what Haliburton has changed ...
Read the NPR article here: http://www.npr.org/templates/story/story.php?storyId=12823729
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