Google blog: what is the monetary value of social links

Source : http://analytics.blogspot.co.uk/2012/03/capturing-value-of-social-media-using.html

Measuring the value of social media has been a challenge for marketers. And with good reason: it’s hard to understand exactly what is happening in an environment where activity occurs both on and off your website. Since social media is often an upper funnel player in a shopper’s journey, it's not always easy to determine which social channels actually drive value for your business and which tactics are most effective.

What this “Social Value visualization” is showing is the number and monetary value of all your goal completions against those that resulted from social referrals - both as last interaction, and assisted.