Can anyone be of great help?

I found this tagged to a group I love to visit on Facebook, I couldn't help but share to see how far we can spread the word till the young man in the middle (Rob) gets any new info about his dad's whereabouts.

"This is my dad. Hamidu Mamuda. I haven't seen him since this picture was taken. Circumstances beyond my control. I want to find out what happened to my dad. If you are Nigerian especially from Jos or Plateau state please share this picture. He wrote to me often until I was 16 but I didn't find the letters until I was 36. Like you all I loved my dad and now this is my last chance to find him. Please share this picture with anyone Nigerian" - Rob Mamuda