This is a questions asked by many different people, from the social media manager, to the PR manager, to the Marketing Manager and even the CEO. Unfortunately, the answer isn't easy.
Today's shared article is from SEO Book and it covers just this topic, including the fact that there is no standardized way to measure ore report social media impact - which is something that anyone new to social media needs to know. It is also important for any one in charge over you to understand this as well.
The article also covers things that should be measured, what to look at and questions to ask yourself as you consider measurement statistics.
Check out this valuable article here: http://www.seobook.com/measuring-social-media