I have never known what to think about Klout. I check it but almost shamefacedly as if I was doing something I shouldn't (some people feel this way about doing a so-called vanity search - looking themselves up on Google - but I think that's important and necessary).
What is klout? According to their website the Klout Score "measures influence based on your ability to drive action. Every time you create content or engage you influence others. The Klout Score uses data from social networks in order to measure: true reach (how many people you influence), amplification (how much you influence them) and network impact (the influence of your network).
Bon Stewart writes in Salon that Klout is bad for your soul. Stewart sees that social media platforms are changing: "We are gradually being directed away from sociality and toward businesslike behaviors by the business interests that design and profit from the platforms we use." She suggests knowing when to take its metrics with a grain of salt: "Klout is good for letting you know whether you’re succeeding in your efforts to improve: It is not and cannot be a measure of success."
David Truss hits the nail on the head when he says: "TRUE influence comes with the delivery of good content, which adds value and is shared generously". He also shares this diagram:
Image via http://pairadimes.davidtruss.com/
For another point of view which speaks highly of Klout have a look at The innovations Lab blog by Will deBock.