I'm a Linux Sysadmin/Automation Engineer/"devops guru". My last 3 jobs (each better than the last) all came from recruiters finding me on LinkedIn.

2 years ago I was trying to move upwards in my career path. I had a good job, but boring and I could go weeks with doing almost no work. I was simultaneously considered a valuable employee while actually operating as fluff. I decided to move into the world of configuration management and "devops". I spent a few months implementing puppet in our lab and in a few places. Then I updated my Linked with puppet experience. A few months later, I got an offer at a local university that was implementing Puppet. I figured I would work there a year and get really solid Puppet Experience. I worked there about 3 months, got much better with puppet, but hated the place. I updated my LinkedIn resume again with my additional Puppet experience (all my responsibilities at the new job were puppet/automation related). I instantly started getting calls. Then I landed an awesome job with a large service company. I loved that job, hated the commute. I wasn't even looking but as I updated my resume, I started getting recruiters from Facebook, Netflix, Google, and finally a work-from-home one from EMC that I jumped on.

Similarly, I've been using it for 15 years. While I don't get jobs from recruiters either, I use it to keep connected to former colleagues even as they change jobs, email addresses, marriages and inter-state moves. This network gets me work.