Nonjews are probably not like this because they have smaller families and specific social groups. Privacy is a highly valued commodity and it is considered extremely rude when you pry into other peoples business and if you do so you are treated with a cold shoulder and people get upset at you.
Jews on the other hand have very large families in general, and then go off to dorm in a yeshiva where theres very little privacy. Theres also the fact that they could have parents that are very involved in different organizations and were therefore exposed to a much larger amount of private information that other people do not have and are used to knowing whats going on with everything.