IT Media reports (Japanese) that netizens have been having fun with the Japanese version of WikiScanner. WikiScanner lets you review the IP addresses of computers that have been used to edit Wikipedia entries. So far, amateur sleuths have turned up addresses linked to various Ministries and the Imperial Household. In many cases, the edits are for entries which relate to issues which are in the portfolio of these agencies. Others, however, clearly are private interests of individual employees. For instance, the Communications Ministry has edited the entry on electronic voting, particularly security concerns, around ten times. The Education Ministry deleted a reference to the scandal involving Masaaki Honma who resigned as the head of the Tax Commission when it was revealed he was living with his girlfriend in swanky subsididized government accomodation. They also edited an entry on Community Schools to praise their own website. The Health Ministry has edited entries on drugs but one official also appears to have added a lengthy explanation of an adult game based on the anime "Nanatsuiro Drops". Perhaps inevitably, the Imperial Household seems to have concerned itself with editing speculation about the Imperial Family. The Agriculture Ministry has been particularly prolific but most of the entries found so far relate to Gundam (see image above). The article notes that Wikipedia guidelines ask that users refrain from editing entries which relate to them directly.
