All my jobs are from LinkedIn, via recruiters for various companies. In fact, I use the number of messages I get per week as a proxy for how well or poorly the market is doing.
I got my current job through LinkedIn too. Hadoop / big data position. I've got quite a few recruiter spam type messages though, but the one I got the job through was an in house recruiter for the company. I figured they were just doing key word searches as my profile isn't anything special. In my profile I put a good paragraph about each of my past positions highlighting experience with the technologies I wanted to work with. 5 or 6 months later this job came up.
I've found ones that pull from LinkedIn do best, but I treat that as more of a comprehensive CV that I would cut down to be a resume for a particular job.
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