Openness versus privacy

Here are some questions I often wonder about concerning issues of online openness versus privacy:

• As a netizen, do I have the right to retrieve my own information from any Web application where I deposited it?

• Do I have the right to completely erase my own information from any Web application?

• Can I receive proof that the totality of information referring to me is actually accessible to me?

• Can I examine the physical tables of those Web applications to ensure that my information is not at risk? Preposterous.

The Facebook Terms of Service, and associated Privacy Policy address most of these concerns, for the Facebook application only of course.

However, going through such lengthy documentation to ensure control of my data is unfeasible given the dozens of applications that we use in our daily life. Is there a site that provides comparative information about this issue?