I gave my wife a carde blanche for this linkedin stuff. Thanks a lot for your advise, mate. It still looks childish, weird and unnecassary for me. Load profile photo, tell about yourself, add friends, send messages and join communities. Facebook might as well add "job section" and be that new job search paradigm.Linkedin is not a social network.
I would strongly recommend that you find a way to be active there yourself and learn the linkedin platform. As others have said, many (many) recruiters work through here and you're not going to benefit from this if you don't know how to use the platform and can't interact with them yourself. A company really can't do this for you.
Being active on linkedin doesn't mean treating it as a social network like facebook. Being active means setting up your profile (basically creating an online version of your CV), joining a few related groups (you don't even have to post in them, you just have to join) and responding to any recruiters who contact you individually about roles. That's it. I'm not a facebook fan at all - but you'd better believe that I have a linkedin profile and it's up to date.
The world is moving more and more online - this includes jobs and recruiting. It's important for your career that you keep pace with these trends and change along with them.
Sorry if my words offended anyone, btw.