SearchWiki was a

Google Search Google Search (also known simply as Google or Google.com) is a search engine operated by Google. It allows users to search for information on the World Wide Web, Web by entering keywords or phrases. Google Search uses algorithms to analyze an ...

feature which allowed logged-in users to annotate and re-order search results. The annotations and modified order only applied to the user's searches, but it was possible to view other users'

annotation An annotation is extra information associated with a particular point in a document or other piece of information. It can be a note that includes a comment or explanation. Annotations are sometimes presented Marginalia, in the margin of book page ...

s for a given search query. SearchWiki was released on November 20, 2008 and discontinued on March 3, 2010. All previously created SearchWiki edits are preserved on the logged in user'
SearchWiki notes page
Google Stars replaced SearchWiki. Users no longer have the option to annotate or re-order search results. Instead, a user clicks on a "star marker" which makes the entry appear in a starred results list at the top of a new search.

References

SearchWiki Internet search engines {{searchengine-website-stub