@David Hicks
You are not alone. The Internet is a place where one gets information, information of varying accuracy and quality. It is not a place to which one should post personal, private or sensitive information regardless of how the "changeable without notice" T&C's may seem to protect your data.
As far as I am concerned the moment my data any of my data is in the hands of a 3rd party I do trust them, I trust them to do whatever they want with it in order to spin a dollar. But I am not exactly new to the Internet, I have been online for over 12 years. In those 12 years I have never provided accurate and truthful information (name, address, postcode, sex, age etc.) to any website that demanded such info in order to access its content. I don't do social networking sites because people in general are vacuous, self-important, look at me types with all the depth of a puddle. Finding pearls, and I accept they do exist, amongst such dross is tedium in itself.
Younger generations especially those who have grown up with the Internet seem to trust it and the corporations behind it blindly.
Cloud computing and applications as a service are going to be a security nightmare. Not only am I concerned about unauthorised persons accessing my data via breaches, I am also concerned that my data will be mined for profiling and marketing purposes and sold on by those who hold it. Then there is the possibility rogue admins/contractors stealing the data for profit. I myself have had administrative access to servers belonging to some big name companies, this includes access to trade secrets, financial records and customer details. Not once did I undergo a background check. If I was a dishonest man I could be very rich, or doing time.
Most T&C's expressly permit the site owner to share any information one posts with "partners" of the site owner. Now who determines who those partners should be? The site owner does, and there appear to be no regulations in place to determine who these partners are or should be. A partner could be anyone from the EFF to Phorm .
Do I fully trust anyone outside my immediate circle of friends? No.
Do I trust individual people? Sometimes.
Do I trust businesses and multinationals? Never, or at least I only trust them to do what is in their own best interests.
Is this paranoia or common sense?
To paraphrase a popular saying:A fool and his data are easily parted