http://disqus.com/people/9f4ce260f5ba979eed17469c906d0215/enFri, 23 May 2008 08:26:13 -0000http://theequitykicker.disqus.com/data_portability_privacy_and_personal_data_stores/#comment-4456179Nic, In your "what I listen to" example I think lastfm and others need to have a copy of your data so that they can do clever stuff like data mining comparisons between you and others to find more recommendations for you - it wouldn't work if they had to retrieve all the data every time from each individual's datastore. If you are a site manipulating this data or doing some sort of transaction then it will get very complicated if you don't store the personal data but rely on an external data store (eg. your shipping address can change over time but the merchant needs to know what was shipped where in case of issues).Dave BrownFri, 23 May 2008 08:26:13 -0000