When you create a new account on Twitter, your Twitter profile is public by default. Unless your account is changed to protected from your account settings, your Twitter data is publicly visible on your profile page, in Twitter search, and through the Twitter API. As soon as they have been made publicly available, third parties (such as Google, ourselves, and other search engines) have access to these publicly visible Tweets—like other information on the internet.
Klout will never access your private data unless we have explicit permission. Users can control the data available to Klout by changing the privacy settings on individual networks. For example, setting your Twitter account to private.
If you would like to opt-out of Klout, please use the opt-out link on our Privacy Page under "Information Collection and Use": http://klout.com/corp/privacy