Twitter is a free, live micro-blogging services that friends, co-workers and family use to keep in touch and communicate. All you have to do is answer one simple question – What are you doing? – in 140 characters or less. It’s a quick and easy way to find out what’s going on with your friends and what’s happening in your city and the world around you. What makes it so useful is that you can send your Twitter updates anywhere - from the web, your mobile phone, IM, or a third party application. You can also receive Twitter updates from your friends on the web or on your mobile phone by adjusting your notification preferences. Twitter has made online communication and gathering information more efficient and mobile than any other service.