Twitter as a powerful marketing tools

Do you know which is the most discussed web-based marketing tools at this point?

Twitter, a 140-character micro blogs/ message that allow your follower to get the immediate update from you. A number of corporate giant has registered corporate account with Twitter as an update to its client/ as an announcement/ as an communication (single-way)/ as an marketing tools.

For instance, Starbucks Corporate account has about 140,000 on its Twitter account.

Existing/ potential customers are getting an immediate update from you, and certain corporate giants find that the Twitter account has help boosted their revenue. It helps to stand-out from alone by having a positive web image.

Do you have one?