If you haven't seen the LinkedIn related headlines over the past 36 hours take heed: Change your password now and if you are using the mobile app on Android or iOS update your app. There have been reported password leaks from the LinkedIn servers as well as the mobile apps scraping your personal calendar information from your mobile device.
You can find more details in the articles below:
Computerworld - Password leak
CNET - Mobile App Privacy Issues
LinkedIn Blog - Password leak
LinkedIn Blog - Mobile App Privacy Issues