It is legally possible to "wave away" your right to privacy. It is somewhat analogous to commercializing your "personality" by giving someone the right to adver

It is legally possible to "wave away" your right to privacy. It is somewhat analogous to commercializing your "personality" by giving someone the right to advertise with your name. However the European data protection standard demands "informed consent", the user needs to be able to understand the scope of his own decision: Which data is captured and to what purpose? Do third parties get access, to what purpose? To which countries does data get sent and what are the risks associated with it? Will your data be possibly combined with data from other sources to build a more complete profile? If it is impossible to answer these questions from the information given in the privacy policy etc., you do not have "informed consent" according to the European data protection standards. There also has to be a technical option present to "revoke" your consent for the future. At the present moment, there is in fact no real solution to use the Facebook-Like button in Germany in a way that is compliant with data protection law. At least I couldn't finde one when I had to write a "memo" for a law firm. However it is somewhat possible to shield the owner of the website from liability.