I've recently noticed a new feature that has appeared at the bottom of blog posts and that is a new colourful button with the phrase +1 at the side of it. It confused me at first and I didn't dare click on it to see what it would do for fear of making my blog implode or something.
I wasn't the only one who had been wondering about this new colourful addition to the blog and as someone posed the question on a writing group I use on Facebook. The question was then very kindly answered and the mystery has been solved. So for anyone still wondering, you can find a full explanation here on the google blog, but basically it's like a Facebook "like" button and will bring posts up the google ladder in search terms.
I hope this helps *thinks I may have confused more than helped*