Internet Advertising Networks In Nigeria?

Hello all,

As I don't live in Nigeria and don't frequent too many Nigerian web sites I am not familiar with the Internet advertising landscape in Nigeria.

As I have a commercial interest in internet affiliate advertising here in the UK i am eager to find out what Internet advertising networks exist in Nigeria if any.

I know for sure that the top 10 internet advertising networks that operate in the UK don't have a presence in Africa at all let alone Nigeria.

Can anyone help fill me in on the Internet advertising sector in Nigeria please. Links to sites or whatever info you can divulge on the topic will be appreciated.