How can a business use Twitter to expand?

[Priti]

Twitter is instant messaging made available to the public,” stated talk show host and author Hugh Hewitt.
I think that’s a fair starting point. I’ve heard others call Twitter a micro-blogging platform.
Here’s what you need to know. According to the State of the Twittersphere report, each day 5 to 10 thousand new people join Twitter. Current estimates of total users top out around 5 million. That’s a lot of opportunity.
Twitter allows you to post updates (called Tweets) as often as you want (and limited to 140 characters). When you follow other people on Twitter, you see their tweets. When they follow you, they see your tweets.