Yes, your data is safe.
First, we will never sell any of your information to direct marketers or give your phone number/email out to someone who is going to call or email you. Period.
Second, while we use the address book and social network data that subscribers upload to help provide better caller ID for the entire community, we use proprietary algorithms to ensure that a subscriber's data is completely private. By uploading your address book and connecting to Facebook, you help us do better caller ID overall without making your information public.