Google just announced the +1 feature to bring social recommendations to search. The initial presentation of the button is that it gives people the ability to endorse search results, and share that with their networks. The problem with that idea is that people are unlikely to recommend a search result without clicking through to the page. But the real idea behind the +1 button is that it will be incorporated on web pages and blog posts across the web (see it live to the left), and when people in your social network +1 things on the web, they will show up in your search results.
If this sounds like the Facebook Like button, that’s correct, but there is more power in this feature if it is adopted. Instead of updating a Facebook profile one time or leaving a trail of likes on sites across the web, the Google +1 shows up when people are looking for information using search. The +1 is meant to be an additional cue to get users to click on search results. These recommendations will also be incorporated into Google’s search algorithm, thereby strengthening the power of personalized search results over pages optimized for all.