It is quite ironic that Google +1 comes in the backdrop of the penalty from Federal Trade Communication(FTC) on the Google Buzz issue. The very fact on which Google Buzz got nailed down upon, is the new marketing fact that will drive Google +1. It is a tool that will now "with a consent", open your private browsing patterns to the whole world. Sneakers like Govt., competitors, rivals( personal and professional) will soon see what you have seen.
The question now is how Google is planning to control the flip side of this tool by black hat SEO guys. These guys will create fake Google profiles, search for their favorite results and start +1. And if Google starts taking the +1 markings into their ranking algorithm, it will surely impact the SERPs adversely.
With Google Buzz issue still fresh like an unhealed wound and in its rush to compete with Twitter and Facebook, we should hope Google will not jump guns in the matter of +1.