No, we do not store your password or even have access to your password when authorizing personalization accounts.If you choose to personalize SwiftKey with popular services such as Facebook, Gmail or Twitter we never store your username or passwords. Instead your credentials are handled completely by each third-party service, and SwiftKey never has access to those credentials.
http://www.facebook.com/settings/?tab=privacy§ion=apps&h=7aaa3de5bdaaf985e98cf8c234754d64 (choose ‘Apps and websites’ at the bottom)
https://www.google.com/accounts/b/0/IssuedAuthSubTokens (our service is called touchtype-fluency.com here)
If you have any further concerns please feel free to contact us.