[cookiecaper]

You are _always_ a representative of Facebook. You can't get away from it, and every thing you do reflects back upon Facebook, just like everything that guy does represents Christianity. This is important to know.

That said, there's no contextual distinction here; using a personal account isn't enough to dissociate your professional responsibilities. Especially not when you're replying to a Facebook user's inquiry directed to you specifically because of your employment at Facebook. Any response to that is obviously going to directly reflect upon your employer, and responding to customer inquiries is obviously a part in line with your duties as a Facebook employee. There is no contextual distinction simply because your response was posted on your personal page and not an official company-sponsored page.