After reading many articles about the pros and cons of the world of folksonomy with tags and the world of taxonomies with ontologies and classification, I am not quite sure how it will fit together. The dashed line in the center of the pic marks the frontier. At the moment I do not believe in reassambling, but maybe there will be something that pushes it forward.
Mashable.com just published a great overview of current social network aggregators. Give it a try!
Take this:
WhoAmI is a tool to aggregate your personal media shared on the internet. Everything what you share, your images, videos, bookmarks, music, blog posts etc. are merged into one place. The content is analyzed on keywords, permalinks and mapped to a simple ontology. If no tags are available the content is automatically tagged. Is a tag identified as location its geodata is added.
The resulting semantic relations are visualized via tagcloud, timeline, map or in detail. For further processing, your media can be accessed via RSS Feed or iCal (e.g. adding to your feed reader or calendar).
Primary access to the data is established trough the APIs of the web-services. Therefore your password or authorization has to be provided. If you feel uncomfy giving away your data, just provide your username. This falls back to public accessible RSS/Atom feeds. Although this doesn’t give access to data of the past, your future content is processed as nearly good as content aggregated via API.
Features in summary:
Hey, check this out! I just found this random sLife profile page. The guy (or somelse) watched (well, not so) strange movies, sLife tracked and shared them online. Now, everyone can see which flicks he watched – nice!. His excuse: pay no attention to the hokey pokey videos there. It wasnt me… I swear!
Well done! 
