content: Absolutely.  My view is that anonymity should be the baseline/default.  This is because if you start with anonymity you can still build identification on top of that through cryptographic signatures.  But if you start from a place of non-anonymity it is much harder to go anonymous. The content propagation model will be an important aspect of how to actually achieve this anonymity though.  I expect it will take the form of some sort of onion routing.