> I also don't know why I should desire to work at company $q which is has a completely incompetent hiring department.
Then you should not try getting a job at all, since many companies have similarly incompetent HR departments, which gather background information on you that you might not otherwise wish for them to use when weighing your application.
I've never seen a company I've wished to work for that cared about my Facebook profile.
Companies that care about their employee's choice of fermented milk will go not be a good place to work at, regardless of Facebook. And they will have serious competitive disadvantages.
Then you should not try getting a job at all, since many companies have similarly incompetent HR departments, which gather background information on you that you might not otherwise wish for them to use when weighing your application.