The Conversions report allows you to quantify the value of social. It shows conversion rates and the monetary value of conversions that occurred due to referrals from each social network. Link social impact to the metrics that you care about by setting up relevant goals for your business.
It's critical to understand which communities matter for your brand. The Social Sources report shows the initial paths that visitors from social networks took through your site. The report also shows engagement and conversion metrics for each social network.
Google +1 and other social sharing features provide an easy mechanism for visitors to amplify your content by sharing with friends. The Social Plugins report shows which articles on your site are most commonly shared and which social buttons are being clicked to share them (for example, Google "+1" or Facebook Like). Additionally, the Activity Stream shows how visitors engage with your content on websites external of your own.