Klout is a perfect example that the act of measuring something alters the very thing you are measuring. After the announcement, people started asking a friend of mine who manages different social media accounts, "How do I create a Wikipedia page about me?" Seriously?!
I opted out during the last big change when I saw that my score was influenced by the Klout scores of the people with whom I interacted. No. Some people have more influence, but every single person is important.