KM on the WWW

Sometimes we look up and see there are patterns we recognize in the clouds. The web, once a truly disorganized and obscure cloud of content exhibiting varying degrees of useful/uselessness has slowly begun to change shape and become structured. Web 2.0 has given rise to a dimension long missing and sorely needed, the usefulness of web content.
However there are limitations inherent in the tagging of content as the users of the web have many worldviews, content tagging is really relative or contextual to the user, how is it useful without the context?

Do you care to see how someone in a far away place with a different culture and language has tagged a piece of content versus someone in your block?
For consumption purposes we tend to cleave as bird of a feather, hence the social tagging that has become so popular now allows us to identify our own small islands of conformity and comfort.

Or does it. There is yet really no way to identify the context of anyone tagging content unless you have first required them to become a member of some kind of group.

Are they in my zip code or not..? Do they speak my language natively, do they have the same goals, politics and religion, how much does this matter.
We are at an interesting point here.

To make web 2.0 (to me this is simply the web that allows everyone to have some say) even more useful we will start needing to know a bit more about all those individuals that make up the wise crowd.

Effectively this will give us the means to start to classify the crowd into ever more specific groups. This happens today on some scale when Google and Yahoo make assumptions about users in order to send the most appropriate ad content their way but of course a standardized system available to all flys in the face of the anonymity of the web.

Is there a single data point that could be shared to help better understand who said what, who tagged what and who wants what..? In the USA the use of Zip code might be a good start but what about elsewhere..?
Inside the enterprise similar challenges have become one of the headaches of deploying global portals when we try and standardize personal data across groups of people whose localities have confidentiality guidelines that differ. Try publishing the home address of a German partner on the intranet and see how far you get.

I will be very interested to see how this develops given how fast the web 2.0 has pushed us forwards.