Who Uses Twitter? Dell, Southwest Airlines and Amazon. How about you?

The New York Times calls Twitter "one of the fastest-growing phenomena on the internet."

Wired says it's "incredibly useful."

Like all social media, Twitter is a fast-evolving tool that is changing on a daily basis. What started as a simple micro-blogging tool (think Instant Messaging, only you can do it from your mobile phone, your computer, etc.), is growing rapidly.

While Twitter hasn't exactly matured into a huge money-making marketing tool, it's worth checking out. Here's a link to the Twitter site and to some other companies that are currently using it:

Twitter
Dell Computers
Apple Computers
Southwest Airlines
Amazon

Note to Delta Air Lines -- it looks like you stopped Twittering about a year ago, which is a shame, because you had it figured out -- mix fun, personal Tweets with light-hearted suggestions on how to make travel easier. Brilliant. Get back at it!