So you can easily see what people in any field expert and influential. Now of course there are plenty of people who are total nonsense and a bit of 'muddling through' on Facebook complacent. But there are also people for whom the online reputation is very important because they have made it their business.
Think of those trainings, bloggers or consultants. Good score shows that you're a professional and as influencer is seen. Of course you can back to the other extreme mildew, by only chatting with people who are at least as high a score as you are. But that's another story.
Consulting your kloutscore on the iPhone was to do with an unofficial app iKlout , which you pay € 0.79. There is also a free app, called KloutScore. This lets you see what scores you and bring friends. Unfortunately the icon displays the number on (34) is not your real kloutscore, but it is a random number. High scoring people include Robert Scoble (89), Pete Cashmore of Mashable (89) and John Gruber (70).