|Unless you're in the IT department at school, you won't be able to create any proxy within the schools network. I highly recommend you talk to the school about accessing facebook. I would bet they have access cut off so you'll pay attention in class instead of mucking about on FB.|
If that's the case, attempting to circumvent their security will leave you liable to getting expelled and charged criminally.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.