I get notifications via email whenever anything changes on the FlexWiki wiki. It's one of the coolest features of FlexWiki, IMO, because I like for notifications to arrive via email/RSS (they're the same to me because of NewsGator). Anyway, it's often my habit to review the changes that have been made to the wiki while going through my morning mail.
Today, I saw something annoying. Somone had gone through and changed a massive number of pages on the wiki, including some of the pages that I'm responsible for maintaining. I went to the wiki and found that my pages had been rolled back to previous versions. It was the work of only a few seconds to restore them to their correct condition, but I was bothered that someone had changed it out of malice or out of ignorance. The more so since it looked like they'd done the same to dozens of other pages.
While I was there, I noticed that David Ornstein, the spiritual leader of the FlexWiki effort, had made some changes to the site layout using his new and ultra-cool WikiTalk engine. Hoping that error and not vandalism was at the root of the problem, I threw a question out on the FlexWiki mailing list to see if perhaps that was the issue.
Not too much later, Tommy Williams, another FlexWiki contributor and a really bright guy, came up with a theory. If he's right it's a doozy!
Tommy noticed that the IP address of the offender is owned by Google. So he figures that the GoogleBot came in and visited the “restore this page to a previous version” link that's on every page in the new layout (it used to be in a dropdown). And of course, we don't have any “hey Google, don't follow this link” magic on those pages. Although obviously we need some, even if that's not what happened in this particular case.
Take this as a warning. If you have any unprotected links to “delete” or “order” or “trigger webmaster's ejection seat” functionality on your webpages, and you're assuming that no human would mistakenly click on them, remember that not all visitors to your website are human.