Google made improvements to its social searching option in February but is now planning to release a more formal version of recommended-by-your-friends searches. Dubbed Plus One, the service will allow users to create a network of friends and contacts and display search results ranked based on what your friends are searching for, not unlike the social searching functions already available in Google search. The changes also include a +1 button similar in theory to Facebook's Like button.
The service will be optional for users and won't replace any of the traditional Google search options you're used to. What it will do is add another layer of results based on your social circle, which in turn could help deliver more relevant search results. For now, the functionality is still in experimental form, but users with Google accounts are able to sign up to use the service. Google also warns that early users may notice the button comes and goes as it makes improvements to the service.