Readings
This article goes over the differences between professional, author and user created metadata. Each having flaws it closely examines the strengths and weaknesses of user created categorisation called folksonomies. Even though the system is highly scalable it hinges on the vocabulary and methodology of users and the tags applied to the information can often inaccurate or only relevant in the context of a specific user. On the opposite side of the spectrum professional created metadata and classification is very precise but extremely costly.
A system that combined the different metadata creation methods into one could provide better categorisation and/or classification and be scalable for the vast amounts of information on the web. Maybe something similar to wikis where 'zealots' clean out irrelevent, incorrect and ambiguous tags and combine similar ones like 'flower' and 'flowers' in reward for reputation in the community would encourage finer controlled tagging.
Creating a separation between public and personal tags for users would prevent irrelevant categorisation by eliminating tags only relevant to the user from the public space, ie: 'me'. These are some ways that tags could be filtered and more exact categorisation and classification could be brought to folksonomies.
Activity - Playing Around
Here's my attempt at creating a derivative work:
Original image: http://www.flickr.com/photos/balakov/1614997917/