Twitter is valuable to businesses because

It is best to use your real name when you signing up. If you do not, your friends won't be able to easily find you. It's also a good idea to upload a picture yourself.

Building Valuable Relationships.
Like most other social networks, Twitter has a way for you to gain valuable relationships and watch what other people are talking about. Twitter makes it easy for you connect with other people outside of your usual group. Try and attract active users you find that are talking about things that interest you. A Twitter follower can be made into a long lasting rel
Traffic That Cares
Twitter can be used as a great social platform for you to interact with other like-minded individules, especially those with the same interests in things you care about. It can be used to establish a solid ground for future benefits such as testimonials or recommendations for your products or services.
Connecting with Local Customers
Twitter can be used to notify customers when you have new products to showcase. Customers can subscribe via their mobile device or RSS platform for instant notification. Twitter can also be used to provide quick updates for a single client.
Twitter Is Free
Twitter can be used to get free traffic to your websites or the sites of you friends or clients. If you ask your friends to tweet about your site, the message will spread faster and further as other users in their circles pick it up. There is a viral nature to twitter and you might as well use it to your advantage.
Staying Current
Twitter can be a source of scoops and alternative news on things that intreat you. You can subscribe to other peoples Twitter feeds for specific websites or events. This allows you to receive and view updates quickly. This can very useful if you are trying to stay updated on very active social news.