Some of the uses of Twitter in the article by JESSICA E. VASCELLARO are:
- Doctors are using Twitter to update patients about office hours.
- Local groups such as the Los Angeles Fire Department are using it to share details about service calls with interested residents, occasionally with graphic descriptions of the victims' conditions.
- And dozens of major companies, like computer maker Dell Inc., use Twitter to share deals and product news with people who sign up for the service
You should read the article at http://online.wsj.com/article/SB122461906719455335.html