By now, it is safe to assume that you know what LinkedIn is, but the question remains if you are using it correctly. When was the last time you updated your profile or sent a personalized message to a connection? Are you actively using your profile to highlight how you can add value to your network? Unlike Facebook, LinkedIn gurus tend to dress nicely and instead of posting photos of their pets, engage in conversation relevant to their profession.  Whether you’ve been on the site for a while, or you’re just starting out, here are several ways you can ensure to leave a positive impression and improve your profile now.