Google recently added Google Sidewiki that you can use to chip in useful information on those sites you visit. If you installed this add-ons Google Sidewiki, then the google sidebar will appear of your browser as two small icon which showing in the picture below.
google_sidewiki (2)

The Side Wiki intro video:

Wikisearch lets a user add comments and ratings to Google SERPs, whilst Side Wiki extends this even further by letting users rate websites even if they may not rank in the results.

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