LinkedIn links a million

LinkedIn, a social networking company focused on businesspeople, said it passed the million-member mark for registered users. The company credited reaching the milestone in part to the launch of its "LinkedIn for Groups" service for networking within specific organizations.

LinkedIn, based in Mountain View, Calif., is one of several Web sites and software offerings that help businesspeople meet each other and establish online connections. Other companies in the space include Matcheroo, which launched its enterprise software in January, Spoke and Ryze.