Digital Dan writes "Twitter is being sued for patent infringement. Surprised? OK, probably not, but you'd think the plaintiff would at least wait for Twitter to actually make money before striking. According to TechCrunch: 'Twitter is being sued ... by TechRadium, a Texas-based technology company which makes mass notification systems for public safety organizations, the military, and utilities.' The abstract to patent #7130389 describes it: 'A digital notification and response system utilizes an administrator interface to transmit a message from an administrator to a user contact device. The system comprises a dynamic information database that includes user contact data, priority information, and response data. The administrator initiates distribution of the message based upon grouping information, priority information, and the priority order.' Two other patents are involved as well."