Microsoft is shutting down its main LinkedIn service in China later this year after internet rules were tightened by Beijing, the latest American tech giant to lessen its ties to the country. The company said in a blog post Thursday it has faced a "significantly more challenging operating environment and greater compliance requirements in China.” Download our local news and weather app for Apple or Android — and sign up for alerts. LinkedIn will replace its localized platform in China with a new app called InJobs that has some of LinkedIn's career-networking features but “will not include a social feed…