Google’s experimental feature “Google SearchWiki” allows users to vote and annotate search results is back again. SearchWiki is not yet available to all users, but you can see a small trace by appending "&swm=2" to the URL of a search results page: an inappropriate header for "all SearchWiki notes".
The new feature is a more transparent way to personalize search results; this time, Google allows users to decide which search results are the most relevant and to share those findings with other users. Instead of bookmarking the results or saving them in Google Notebook, you can make them more visible on a search results page and find them when you search later. Unfortunately, Google's interface will become cluttered unless Google decides to hide the new options until you click on a link like "Edit the search results".
Source:→ Google System