There is a saying in the SEO world that anything Google publishes, unveils or launches, that you should pay close attention to and join up to. At the end of the day every website out there is desperately trying hard to rank well for keywords in their industry, and where are they trying to rank? Yes, in Google, who have over 90% of the market share when it comes to search engines.
Therefore, anything created by Google is always worth jumping onto, and nothing could be more from the truth than Google+, which is a game changer for SEO.