said 8 months, 2 weeks ago:
Your ranking is improved by people +1ing your Page or profile (depending how you promote your business/brand) because you’re then in their circles. When signed into any Google account (gmail, g+, etc) and you do a search that person or businesses info will show higher in your search results if it’s relevant to your search term.
There’s also the rel author tag which is combined with your G+ profile which will boost your posts in Google search if someone has you in their circle.
+1′s on your content from social share buttons also help as well.
If enough people +1 your content or website, it will raise give you a boost without any G+ circle connection (I’ve seen studies that it has to be somewhere around 50 +’s to make any significance).