Twitter is intriguing, part social network, part text message, part location aware it almost redefines communication in its purest sense. Limited to 140 characters and based around a simple text box - a text box, asking "What are you doing?" it is difficult to understand at first..
Take a look at Twittervision - Twitters visualised live on a Google Map:
It begins to make sense when you realise you can activate your phone and therefore send messages remotely to a bunch of people.. anyway while we think of the possibilities you can add digitalurban to your twitter network, and then twitter about anything urban with fellow twitters and readers.