We’d suggest clearing your cache and cookies, and revoking Klout's access in your Facebook settings.
To revoke Klout's access to Facebook:
1. Log in to your Facebook account on Facebook.com.
2. Open the menu in the top-right corner and click Settings
3. Click Apps
4. Click Show All.
5. Find Klout and click the "x" on the right-hand side.
6. Sign in to Klout again and connect with Facebook.
If you are still unable to connect, email us at firstname.lastname@example.org with a screenshot of the error.