The Twitter badge on this site (twitter.com/kirklapointe), and the ubiquitous recent references to the 140-word dispatches across all media, lack one thing: A business model. For the time being, Twitter is free of anything commercial (although some services are offering to buy your Twitter profile in order to serve up ads on your Tweet network).
O'Reilly Radar posits there is gold in them thar hills, though, because Twitter has a lot of personal information at its disposal as a result of an individual's Tweets. All it takes is a little semantic workmanship and, presto, a very distinctly tailored form of advertising could be fashioned that would be so relevant its audience wouldn't rebel. As Twitter sets its sights on making money and not just building value (it supposedly turned down a large offer from Facebook recently), using semantic technology might be the answer.