Yes I am serious about getting a new job. I update my profile on Linkedin as well and my hope about this is that my new workplace will locate me.
Because it´s not just about to find the right workplace it´s also about that the right workplace can find me.
And ofcourse Linkedin profile is important because thats the first impression. so if you got a Linkedin page then it´s good to update information if you have done something new since last update. Or if you like me had write to short information since I had in mind people can ask if they want to know more.
But why shall someone ask? How shall they know what to ask? It´s rare with mindreaders so it´s easyer to update information.