Search Engine Marketing Blog by ineedhits: Google Testing Vote Based Search Rankings:
Google's efforts to introduce social elements into its search results seem to be gathering steam, and their latest test is 'voting buttons' in their organic web results (SERPs).
According to the Google Experimental page for the new vote functionality:
'This experiment lets you influence your search experience by adding, moving, and removing search results. When you search for the same keywords again, you'll continue to see those changes. If you later want to revert your changes, you can undo any modifications you've made. Note that this is an experimental feature and may be available for only a few weeks.'"
From Internet Marketing and Online Annonsering