Penpal for preschoolers?

I'm looking for a penpal for my 4 year old brother. If you have a good website for preschooler penpals or an brother or son that is around 4 please tell me. Thanks!
umm, for your information, I don't think he/she would be interested in a penpal considering they don't know how to write! When I was four I didn't know dang sh*t how to write my name, let alone use letters and numbers! I don't know if you are telling the truth but I don't think this is a good idea.
 I agree with the above poster..a 4 year old can not write..does not have the understanding of what a penpal is...she would get no benifit from this..not understand why she is having to send this person she oesnt know something..and likely become defient if you force it on her!. The best form of communication for a 4 year old is playing with another 4 year old..