Klout is a measurement tool which gives an idea of social web influence (at least via Twitter). Their data is used by applications such as Co-Tweet, HootSuite and others. Like Twitalyzer, Klout measures various aspects of Twitter usage and network, but focuses more on how influence and messages are spread via your network. Just because you have a lot of followers doesn’t mean that all of them are actually listening and engaging with you (and they probably aren’t). Klout gives you an idea of what your actual reach is and how engaged you are with your network (and vice versa).
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