Here's a great little video on what Twitter is, in laymans speak. Really good overview. When people start using Twitter, the big problem is understaning what it is. Because the thing that made Twitter viral is also its biggest obstacle to user adoption. People just don't get it straight away.
In fact, check out CommonCraft's YouTube channel here. They do plain engligh' explanations of blogs, wikis, bookmarking and RSS, to name a few.
The Twitter video's pasted below too:

I didn't know what twitter is and i saw that video that showed me how it works. Twitter is a communication tool that helps you answer the question of what are you doing now. It helps you find friends across the world, meet people of different areas and fields,have immidiate answers in questoins, promote good cause issues......
It saves time and gives the opportunity to do multiple things.Additionally it can be used for internal communications.Think about its use....
Posted by: giota | April 30, 2008 at 09:55 PM