It's just a business tool
Meh - I have a LinkedIn Account and I've often found it useful for work related activities; including finding a job, getting to know possible employers and clients, and generally creating a business profile. Used sensibly it's a useful tool. I get annoyed by the spam-like emails, the users who mistake it for FaceBook and the clueless who post/invite/whatever - but the noise to data ratio on LinkedIn is not better or no worse than other social media sites IMHO. Whether it's worth more or less than whatever its valued at today I have no idea, but it's pointless in my view slamming a tool (the site) when as a tool it's only as good as the person(s) wielding it.