I added a comment to my MP's contribution to the NHS debate on I agree that all too often the NHS...: 9 May 2006: House of Commons debates (TheyWorkForYou.com).
It is innocuous and contains a typo but as a worked example I think it shows the potential value of the service.
I suppose that in a way www.theyworkforyou.com is a social network just like www.myspace.com. It is still early days but I think I am beginning to understand where Marc Canter's Digital Lifestyle Aggregator might fit into this picture.
Update: I see that in this view of the speech in context comments are included as well.