Obviously this is a cultural issue; westerners say its child abuse, nigerians call it discipline. I think it could be either depending on the circumstances.
Spanking definitely has its place, but I think it should be sanctioned by the level/nature of the child's offense. I mean, children should not be beaten for failing their exams, like someone mentioned here. And I think it should be a last resort; not for every flimsly misbehavior.
Secondlyly, I also think that the manner in which the spanking is done/ instruments used is very important also. This is what makes the ultimate difference between 'spanking' and plain abuse. I've seen some ppl using whatever their hands could find (belt, shoe, extension cord), or both hands and feet, to knock their children around. I think spanking should be focused on one part of the body, like the hand, butt or back, and it should not be overdone, i.e. bleeding, swelling is clearly unacceptable.
One of my western friends told me that africans spank their children as the easy way out. I think its true in some cases, but after observing some of these american/canadian children for a while, I think a good dose of our sadistic secondary school teachers is well in order. Lack of respect, blatant immorality, in some cases shooting up the place - yea, i think a good 25 lashes on the bottocks should do them good lol. I dunno if I'll spank my kids; it depends on where i end up. If I settle in Nigeria, then yes. If in the West, then of course not. We have to be aware/accomodating of cultural differences.Plus there are many other ways of punishing children u know.