When you have a look at many websites status on Google, especially in recent months, you will figure out that content is becoming more and more significant. Truth is, Google has already discovered that many companies are using professional SEO services and their websites already are powered by decent types of links from high PR spots, and the ones with more compelling contents seem to be winners in their niches.
Links will still remain very important indeed because they are bridges between web pages and some votes cast in favor of websites, but then on-page elements, mainly contents will arrive at the scene to play their exclusive roles. Google plus as mentioned is getting bigger and bigger every day, almost marginalizing the rest of the social media resources in the future and counted as an SEO ranking metric.