Perhaps, if you are at a stage in your career where you might be changing jobs somewhat regularly, LinkedIn might be useful. However, be prepared to be spammed.

Perhaps, if you are at a stage in your career where you might be changing jobs somewhat regularly, LinkedIn might be useful. However, be prepared to be spammed. I am in a steady job, nearing retirement. I used to get a lot of spam loosely related to my work. Since I deleted my LinkedIn account, the volume of such spam emails has decreased by at least 80%.