LinkedIn has been compromised by Russian hackers who have proven that they gained access to the data of at least 6,458,020 users. 

If you have a LinkedIn account, it's advised you change your password as soon as you can to protect yourself. Also, if you've used the same password on other accounts like your email, bank accounts, and other sensitive personal or company data, you should probably change those to avoid other breaches.

You can read more on the story here and info on how to change your password:

http://www.businessinsider.com/heres-how-to-change-your-linkedin-password-after-todays-security-breach-2012-6