I know that a lot of smart companies are using Twitter these days. They are using the service to keep in contact with their customers, to field new ideas, to let their customers know of new announcements, etc. The commercial uses for Twitter are many.
As a consumer who might be using Twitter, it can be hard to find these companies on the site without manually searching for them or getting lucky. For example, when I was flying Southwest Airlines a few weeks ago to Seattle, I only by chance came across the fact that Southwest is active on Twitter.
In looking for a directory of companies using Twitter, I ran across a very useful resource called Social Brand Index. Their Twitter directory has a lot of accounts listed, including non-profit organizations, government agencies, media organizations, etc.
There is also Twellow, where you can search not only for companies but also people, categorized based on information in the profile bio.
I find it odd that Twitter is depending on third-party directories like this. Seems these would be extremely useful additions to the main Twitter site.


