I see this as part of the challenge - being able to access archives while maintaining and controlling a hierarchy of usefulness/meaningfulness. I think the author would agree with you on the issues you bring up, but worrying about spam is part of building tools where you still get to choose who accesses your 'memories', as much as we choose who comes into our house and into our lives. Open standards for controlling access to data is needed alongside any building of memory aggregation tools.