Here is potentially a great new way to help with your SEO rankings. Go to Google and search for anything in the English language. Then mouse over one of the results, you will notice that some new link appears "share" This will allow you to share the site and give it a +1 vote without the site needing to add the usual code for a +1 button. This leads me the think that they must use this data in a different part of their algo. So if you can game this system by inflating the vote count directly from the search results, you should see it have a positive effect on your search engine rankings.