definitely not in Nigeria.
Pen pals should NEVER ask you for stamps! If they do - they can’t
afford the hobby! Drop them!
Pen pals should NEVER ask you for money.
Never ever put your phone number online.
Be very specific about the sex, age and kind of pen pals you are
looking for. Sometimes this weeds out getting letters from people you don't want
to hear from.
It is always best to rent a PO Box from your local post office. It is
Pen pals do not need to know your income or the kinds of material
things you own.
When placing an online pen pal advertisement give your email address
and not your home address.
NEVER, ever give out your social security number or bank account
information to anyone for any reason! EVER!