LinkedIn is a hotbed of recruiters, so any time I feel the urge to go jobs fishing I whisper "Interested in a new position" into my phone an instantly get spammed with a dozen different people posting positions.
It's not the worst place to go job hunting, just because everyone shilling for HR departments is already there. It's just full of silly bullshit, too. Like walking through the skeezy end of a carnival every time you want to go ride the Ferris Wheel.