Twitter, I believe all internet users are aware of it by now. Twitter has a more convenient feature compared to previous online services: you can update your status or receive the latest updates from your friends via mobile text messages (of course, you can also update and check messages from Twitter through WAP). Moreover, receiving updates via mobile text messages is free. The current popularity of Twitter has led major media outlets like BBC and CNN to use Twitter to disseminate their news. If we first add these media outlets as our friends and then set our receiving end to our mobile phones, it's equivalent to subscribing to the free mobile news service of BBC and CNN on our phones. Truly, the world is at our fingertips.