Alex raises some important questions. My thoughts are that there is an opportunity for innovation here, but also a collective action problem.
On one hand, I think that the new web is about transparent identity, which requires a certain amount of disclosure and mutual sharing of info. But we don’t have the standards and the trusted intermediaries we need. We also haven’t established clear principals that I own my data and that value derived from it should somehow flow back to me; nor the mechanisms to make that principal a reality.
So is the solution a technical one, matter of personal choice and education or regulatory? I don’t know, but it is an interesting and increasingly important problem area in need of new ideas.