Twitter really leveraged the concept of an Asymmetric follow . i.e. I can find people I’m interested in, irrespective of our relationship, and learn from what they have to share. Similarly, Others can include me in their lists. It mimics real life, i.e. there are asymmetric levels of interest in all our relationships.
It also mimics real life since friendship grows with complete strangers over time only by communicating with them. In fact, through Twitter’s wonderful system of @ messages I find myself having conversations with complete strangers so many times. Most humans react positivley to attention, so we follow our @ messages more faithfully than our actual twitter streams.

Now comes the thinking aloud part:
Since the users have been warming up to the concept of lists, could twitter (or any network app) as a next step allow users to send directed messages ? For example: I have two very distinct set of followers on twitter 1) People in Bloomington 2) Techy/geeky friends from all over. The B-ton folks might like what I have to say about B-ton and everything else, but my techy/geeky friends from everywhere else might not be interested in what is happening at b-tons @bluebird bar tonight. Since there are specific lists that I follow, for example the really well curated list of Bloomington tweeple , I could plausibly @message the list & it would only show up in the twitter streams of my followers from that list . Or, since twitter already allows users to mention their location, I could @~ or @# a location ( e.g. @~bloomington or @#bloomington,IN ) when I tweet.

There could be many more interesting ways of using this, without making it into a twitter-HTML . Facebook already tries to do the same in very confusing and inefficient ways (my opinion). I hope Google buzz would have something on these lines. (This chain of thought started when I heard that google buzz, which mysteriously has not yet (1am,feb 10) shown up in my account, had mimicked twitter’s asymmetric follow.)

The video just hit he nail on the head. So I deduced my own layman definition of Immediacy & hyper-immediacy, for designers:

All interaction is though a medium. We seek the interactions to be immediate, for achieving this we try to reduce the need for a medium. The lesser the dependence on a medium – the more “immediate” is the interaction . Eventually the goal is to achieve hyper-immediate (no medium required) interaction.
What Zong is trying to do here is two fold:

• Reduce the number of steps involved ( one always remembers the phone number; a credit-card has to be found in the wallet at the other end of the room.)
• You no longer have to travel the psychological distance of giving out the credit card to the infinite web. ( I know, I know. There are issues with giving out the phone number too – but I hope you get the point of : medium, distance & immediacy.)

If you want an even simpler definition – My designer friend in Dubai always said “I design for my lazy self.”