So I received several emails with the message "messages waiting in your inbox" supposedly from LinkedIn about my connections and contacts. I deleted them automatically knowing that they made no sense cause if someone were to write to me, I'd get notified anyway. Come to find out, LinkedIn was the latest to be targeted for an email attack just like Facebook and Twiter in recent weeks.
This attack was so huge that apparently one quarter of all spam email sent out last week was directed towards Linkedin users. Basically it looked like an invitation from someone looking to connect and if the link is clicked on, the user is taken to a web page where a trojan horse program gets downloaded and embedded into the user's browser. The purpose of the trojan program is to capture all keystrokes to hijack personal information such as online banking information, passwords to other sites, etc.
Best thing to do is AVOID curiosity and delete anything that looks suspicious. You know that if there was a message waiting for you on Linkedin, you can just as easily log into LinkedIn and read it. Remember, never click on a link that you don't recognize, rather go to the site in question by typing its url in the browser window and thus protect yourself from going to a hacker's website.