There is a simple rule: if you don't feel comfortable with the idea of people seeing information about you, then don't publish it online.
With that in mind I would like to share the following article. Although it's about a person posting images of themselves on Facebook holding guns from their collection, this is in America, so the guns are owned legally and no crime is being committed. Nonetheless, it's transpired that the individual's employers used something called Administrators Access to gain access to the user's profile.
This allows a range of interested parties to apply for access to your profile. You can read the full online article here. Think about it. What have you posted that you wouldn't want a university admissions tutor to see or read?
Be choosy. Be careful. As the saying goes, 'Knowledge is Power.' And the power of personal data that's been misconstrued or taken out of context might cost you dear at some point in the future.