As it looks like, post revisions are public.
Sometimes, a new user (or somebody who did not think long enough) posts code samples that contain real-world data that should probably not have been there in the first place. Like in this question: Double byte Unicode shown as 2 characters by classic ASP.
Now when the person corrects the mistake and uses harmless data instead, search engines will still happily index the old revision, so somebody might find data through a regular search that was never really intended to be public.
Adding "nofollow" to the links that point to revision pages would prevent that kind of disclosure. So:
- Did I get the facts right (about search engines seeing revisions)?
- Would it make sense to prevent this for protection of the lightheaded (and the third-parties that do not even know that their data has been disclosed)?
- Would it break useful functionality?