Via Talking Points Memo, this reminder that on the Internet, nobody knows you're a dog...but they do know what terminal you're using:
In late August, someone with an IP address that originated from the National Institutes of Health drastically edited the Wikipedia entry for the National Institute on Drug Abuse, which operates within NIH. Wikipedia determined the edit to be vandalism and automatically changed the definition back to the original. On Sept. 18, the NIH vandal returned, according to a history of the site's edits posted by Wikipedia. This time, the definition was gradually changed, presumably to avoid the vandalism detector.
People forget about this quite a bit. On the Internet, your browser must send a request to a Web server to get a Web page. In order for the Web server to respond, it has to know where to send the page; ergo, every time you hit a Web site, you tell that site who you are. Wikipedia uses this simple fact to help determine the value of contributions. In this case, it worked perfectly.