And just to dispel one more misconception that I saw a few people speculate on: if user A edits their search results, it doesn’t affect the search results for user B.

There is an option for users to go check out notes left by other users, but that requires additional explicit work–by default, users don’t see other users’ notes. And even if you do the work to see other users’ notes, other users’ changes don’t affect your search rankings.

So this purely modifies your own search results rankings. So if you spam the rankings, you’re only spamming the rankings for yourself.

http://googlesystem.blogspot.com/2008/10/google-searchwiki.html#c264089502535899205