I'll have to check that website out. I've got several old friends from that region, mostly in the Cross River Territory. Most were boy soldiers in the Biafran War, others are members of princely families. However, there that means your family is the traditional authority over a couple-three towns and a bit of the surrounding countryside. One guy I knew is now a King, which boggles my mind, he could barely walk and chew gum when I knew him.
I've been worried about those guys due to the oil war in the Delta over the past few years and the general chaos that is Nigeria.
A listening tip for this particular area. Listen very carefully for English words you recognize. A lot of the time these fellows are speaking English, but their accent is so pronounced, it can be very hard to understand. Once you get the rhythm, different syllable stresses, and slightly irregular word order down, they're fairly easy to understand. It takes a little time, but it's worth it.