Klout provides social media analytics that measures a user’s influence across their social network by collecting data from sites such as Twitter, LinkedIn and Facebook. It measures the size of a person's network, the content created, and how other people interact with that content.

Social media influence is measured by using data points from Twitter such as: following count, follower count, re-tweets, list memberships, how many spam/dead accounts are following you, how influential the people who re-tweet you are, and unique mentions. This information is blended with Facebook and LinkedIn data such as comments, likes, and the number of friends in your network, to come up with a very consumer-friendly "Klout Score".

Even better for PR and comms people, and unlike Facebook Insights or Google Analytics, you can determine anyone’s* Klout score and is therefore a fantastic research tool as part of any social media audit and strategy.

*With an online profile.