I'm trying to set up a wiki which can tell you how close other users are to you, and/or show who's where as per this site or the http://london.openguides.org but, er, have no real clue how to do it.
Initial stumbling blocks are:
- How to modify the user registration so that it can include a postcode/zipcode?
- How to "tag" wiki pages with a certain postcode?
(I'm assuming most users won't know their longitude and latitude)
Any clues? Is anything like this under development?
BTW there's a natty free database of UK Postcodes and geolocation data at jibble.org
Thanks very much for any pointers