Since I am an international student myself, and have experience working in various international office throughout different industries. I can bring in the insights needed for a well functioning international marketing team.
My answer supposed to be "Firstly, the global challenges are keep the innovations ongoing and to all costs keep the Facebook a positive experience to the public (otherwise people will leave, soon or later), and in my market particularly the innovations have to related with our cultural behavior, etc..."---This answer actually never happen because when I said "Firstly, the global challenges are", the recruiter just cut me in a very abrupt and rude way and said "I did not ask you that, I made a very particular question..."..you remember when you were a child and was told off??? I actually neither have memories of this kind of behavior when I was a child as I was always explained about things instead of screamed at... Could I put myself together after?? Not really...Should I have?? Yep.. I should have known better.
It is misleading to answer the market-specific question with *global challenges*.