See Who Is Whitewashing Wikipedia

Decius6i5 writes: "Caltech grad student Virgil Griffith has launched a search tool that uncovers whitewashing and other self-interested editing of Wikipedia. Users can generate lists of every edit to Wikipedia which has been made from a particular IP address range. The tool has already uncovered a number of interesting edits, such as one from the corporate offices of Diebold which removed large sections of content critical of their electronic voting machines. A Wired story provides more detail and Threat Level is running a contest to see who can come up with the most interesting Wikipedia spin job. I'll bet Slashdot readers know of some interesting IP address ranges to check."