We have released updates to the scoring model that will affect the Klout Scores of all users beginning today. In this update, more inputs have been added to the scoring model from Twitter, Facebook, foursquare, Google+, Linkedin, Klout, and Wikipedia. To learn more about these changes, check out discover.klout.com and The Klout Score page.
Your previous Klout Score and history will become inaccessible. The updated Klout Score would not be comparable to the old Klout Score given the differences in inputs and we would be unable to support both the updated and old scoring model at once (which would be required to show you your previous Klout Score history).