The guys at CommonCraft have created this great video on what exactly Twitter is all about. I joined Twitter a few months ago and had not been using it at all. I was confused as to why I joined and why it would be useful or fun. Then I downloaded a little desktop application called Twhirl, and activated Twitter on my mobile phone. It suddenly got fun. Updating whoever cared what I happened to be doing at any given moment became a near obsession. Seeing what others on my list were up to was also fun.
The best way I can explain Twitter is that it’s like instant messaging (MSN, Yahoo!, GChat, etc) but not as frequent, and with more users. It’s like a blog, but with shorter, more frequent posts (limited to 140 characters, to be precise).
You can export your Twitter posts to your blog, your website, or any other web space you can think of. Your clients can follow your updates, and it’s a great way to share new information (listings, price changes, sales, or even the latest webcomic). I think Twitter is pretty useful, it’s easy to use, addictive, and a short <140 character message is not a time-sink like many web applications. Give it a try.