WHAT IS TWITTER ??

According to Wikipedia -

Yes , Twitter is a "free social networking and micro-blogging service that allows its users to send updates (otherwise known as "tweets") which are text-based posts of up to 140 characters in length."

Try saying something like this:

Twitter is a free online service that allows you to send messages to hundreds (or even millions) of your friends all at the same time. Your Twitter friends receive an alert each time you send a new message either on their mobile phones and/or on their computers.

REASONS TO USE TWITTER
The inevitable follow up question to "What is Twitter?" is "Why would I want to use Twitter?" So now you need to explain the value of Twitter.
Variety of Content:
Part of the reason why Twitter is growing so fast is because of the variety of content available. Everyone from major icons like Barack Obama and NBC's Today Show to the average teenager, are already on Twitter. Everyone has a unique viewpoint and Twitter makes it very easy to express ourselves.

Instant Information:
Twitter users are all tweeting information as it happens and before it can be elegantly written up into a blog post or news article. It's like tapping into a collective word-of-mouth source with the ability to spread instantly.

Promotional Tool:
Twitter can also be an excellent promotional resource. At one point in our lives, we will assume the role of "promoter" for something or another. If you are in a band, have your own blog, are throwing a big party, raising money for a charity or just want to show off your vacation photos to your friends, then Twitter can help you quickly get the word out.
Here are a few examples of "promotional "tweets” that can help drive web traffic.

POPULAR TWITTER USERS
If someone asks you who they should "follow" on Twitter besides their friends (and@methodshop), tell them about a website called Twitterholic. Twitterholic.com provides a list of the 100 most popular Tweeters based on the number of their followers.@adamter
The top 10 people on Twitter changes frequently. Current top Tweeters include Ashton Kutcher (@aplusk), Ellen DeGeneres (@TheEllenShow) and Oprah Winfrey (@Oprah). But just for fun, here are a couple historic screen grabs from August 2008. Barack Obama is #1 with 57k followers and Kevin Rose from Digg.com is #2. At the time the screen grabs were taken, the 2008 American presidential elections were only months away and Twitter hadn't gone mainstream yet. Barack Obama used his Twitter account to help build hype around the announcement of his VP running mate, Joe Biden. As a result, Obama quickly skyrocketed in followers and he stole the top slot on Twitter from Mr. Rose.

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