First of all I would like to clarify that you aren’t the only one who has this doubt in terms of distinguishing between one’s personal and private life. It is necessary to bring this up as there are a number of misconceptions surrounding the same. Employers never make it clear as to why do they give importance to your social media profiles. But on a logical front, they are not interested in stalking you creepily in order to know the latest ongoing buzz in your life. This is your personal space which the company officials don’t intend to intrude upon. You may be at the next big party or might have shared an offensive opinion but it doesn’t bother them. All they are concerned about is what kind of an employee is going to join their organization.
We are well aware of the fact that a background check is necessary while hiring someone. Even when we hire domestic help for our homes, we run a background check. Then why are we against a background check when it comes to us? Another reason why employers ask us for our password is that it is a test to know if you have anything to hide or not. Among the interview panel are experts who can judge you by your reactions and body language. A number of times the password is not even used but is a test for you.
Moving on to the part where you feel that you need to be careful before posting anything. Well this comes under your personal life. It means that even if your colleague or senior is judging you on the basis of you hanging out with the opposite sex or the opinions you shared, that is on the personal front. He is not questioning your
professional capabilities by doing so. Judging people on the basis of the social media accounts is a common phenomenon these days and is not related to your professional efficiency. If your colleague lets his personal judgment affect your professional relationship with him, then I advise you to bring it to your manager or HR’S notice.