Google +1 is a recommendation system for websites, search results, ads, pictures, movies, etc. The idea is that enabled item present a +1 button which any google account owner may set on (or off) by a simple click, and therefore mark the item with a personal “stamp of approval”. Google keeps tracks of all individual votes and use them to learn real people like. It looks a lot like the Facebook “I like” button but Google being the most popular authority on the net, it will have a major impact on SEO and website traffic when Google starts evaluating this information to determine search rank positions and tailor results to specific people based on their liking.
Like everything, there are two sides to this story:
For “voters” it is only a matter of clicking on the Google +1 button while being logged into your Google account. If not logged into your Google account, Google +1 code will invite you to do so on your first vote.
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