§ Twitter is more powerful than digg: you can discover better stuff there by following great people whose twitt direct you to great articles or other great people.
§ Twitter makes blogging easy. Let’s say you discover something interesting that is relevant to other people. You wouldn’t call, email or facebook your friends about it. Twitter makes sharing anything possible and easy.
§ Twitter is a unique place that makes interacting with smart and like minded people possible. Talking with influential people is difficult if you don’t know them, you are more likely to get a reply if you tweet it out.
§ Twitter is designed to make new acquaintance whereas Facebook is all about reconciling past ones. Most people have few actual friends on twitter. On twitter all you do is meet new people.
§ Twitter is real time. Twitter was the first to break the Hudson River (NY) plane crash news. A guy twitted an iphone picture right after the crash.