According to Google:

“The changes you make only affect your own searches. But SearchWiki also is a great way to share your insights with other searchers. You can see how the community has collectively edited the search results by clicking on the “See all notes for this SearchWiki” link.”

Voting on and annotating our sites and coopting our friends, employees and co-workers to do so too may be yet another chore to add to the ever expanding list of compulsory SEO tasks.