AS MARK FULTON points out, you can use Ping.fm to update your LinkedIn status from Twitter. His idea is better than the new LinkedIn application because you can squelch the noise better with Ping.fm than you can with the LinkedIn application. Here's how you do it. First, sign up with Ping.fm. Second, create a group called something like #NotTwitter and let it ping everything but Twitter. Then create a group called #NotLinkedin that pings everything but Linkedin, and so on. Ping.fm is handy because you can selectively update all sorts of networks.