Klout is the standard for influence.
We believe that every individual who creates content has influence. Our goal is to accurately measure that influence and provide context around who a person influences and the specific topics they are most influential on.
Klout tracks the impact of your opinions, links and recommendations across your social graph. We collect data about the content you create, how people interact with that content and the size and composition of your network. From there, we analyze the data to find indicators of influence and then provide you with innovative tools to interact with and interpret the data.
The Klout Score is the influence metric. It measures overall influence through 25 variables broken into three categories; True Reach, Amplification Score and Network Score.