While I've never done much with my LinkedIn account, Stewart seems to nail it pretty well. I follow the feed on my home page and there does not seem to be much going on outside of people connecting with other people.
But I don't know. When I start actively searching for a new writing contract here in a month or so, I suppose I'll find out what LinkedIn is worth.
Indecision 2012 - Meet the Prez - The Daily Show with Jon Stewart - 09/27/11 - Video Clip | Comedy Central: