The hardest pill to swallow here is that you'll never know THAT is the reason they passed on your application. I mean, unless you know someone on the inside and they give you the head's up. I've applied to jobs plenty of times and after their passing on my application, I only ever get some generic form letter: "while your qualifications and achievements are impressive, we've decided another candidate was a better fit for the company".
I've gone so far as asking for a little feedback as to why they didn't feel I was the right fit for the company and my request generally falls on deaf ears. All you can do is set your profile to private with a few generic posts showing as public (apparently they must be about praising your work/industry), and hope it all works out for the best. I guess you just aren't allowed to have an opinion/private life in this world.
Great article!