I would do this, but my data has been up in social media long enough that I don't believe it makes a significant difference if I superficially "delete" it now. Maybe I'm wrong?

At this point, I just don't add anything new. If they're going to host my content ad infinitum, I might as well use their storage space and bandwidth.

I guess it probably would be worth ditching LinkedIn. There's no good reason why a [worthwhile] prospective employer would require it.