If you are not already using it for your SEO purposes you need to be. We already know that social likes, tweets and google plis 1's effect seo in a positive way so if your not already on the bandwagon, you need to be!
You thing to be aware of is those dodgy +1 sellers. If those votes do not look natural - you may just be wasting your money and at worst attract negative attention to your site. +1's like backlinks must be natural.
The best way to get them is to highlight the +1 icon and even offer people incentives to +1 kind of like people on facebook advertising likes.