So heres a question we here all the time
what is Twitter??
Twitter is a free Social Networking and micro blogging service that enables its users to send and read other users' updates known as tweets.
Tweets are text basedposts of up to 140 characters in length which are displayed on the user's profile page and delivered to other users who have subscribed to them (known as followers). Senders can restrict delivery to those in their circle of friends or, by default, allow anybody to access them. Users can send and receive tweets via the Twitter website, SMS (text messages) or external applications. The service is free to use over the Internet.
So to put this in easy to understand terms Twitter is a way to tell people exactly what you are doing every second of the day. Some call it voyeuristic some call it a breakthrough call it what you will it's ridiculously popular and shows no signs of going away any time soon.
give it a try
Source: wikipedia.com