Diukapa HankaWou
Diukapa HankaWou voted up echooos echooos' answer

I'm guessing he's just really not into Facebook.

Diukapa HankaWou
Diukapa HankaWou voted up Anonymous' answer

He doesn't like Facebook. Maybe ask him if he wants to message another way? Perhaps KIK, Skype, or text? It's more personal and private.