Almost immediately after the introduction of the +1 button, people began selling +1s with the attached claim that it would help your SEO; specifically, that getting more +1s improve your ranking in search results.
Most SEO professionals will agree that +1s help with SEO, and that concession is the end of the matter for most people. The truth is a correlation between +1s and search ranking hasn’t been proven to exist. When SEO professionals and Google say that +1s help with SEO, they’re referring to Google’s search plus your world.
When web professionals use the term SEO, most people automatically think about ranking first on Google. SEO stands for search engine optimization, and it means exactly that. If I could change the background of my listing to bright red, that would be a form of optimization because searchers would be more likely to notice me.
While Google doesn’t give you that kind of control, there are other things you can do to optimize the actual listing that will improve your click-thru-rates.