Essentially you fire up this app, log your facebook, twitter, whatever details, and then it hooks into everyone’s systems and when they post it re-posts it as an update in the locality that you are on. So you essentially snoop on what people are posting in your area. Could be lots of fun for games – would no doubt be used for perving, “short skirt sighting”, and then you could watch as other people also sight said short skirt.
I’m not sure whether it would re-post it on our service, or whether we can just use the fact that most media is posted with location based devices such that we could query facebook/twitter for posts that are tweeted and public in that area.