I have a few things to say before I run away and hide.
1. I was spanked (hit with an open hand on the butt with minimal force) when I was little (under ten) by my mother. It never hurt, but it certainly was embarrassing and got my attention. I was a rambunctious, back talking kind of kid. I was in time out every night. I had my own time out chair under the microwave and I'm surprised that I don't have some kind of lasting effect from the radiation!

At some point time out just isn't enough or stops working. It was always in response to a serious, repeated violation or to something that would hurt me (running away in the parking lot and the like). It didn't scar me for life in anyway.
2. My step-dad definitely beat us (Hit with a mostly open hand on the butt with tremendous force (we're talking red butt cheeks). That was in response to everything we did wrong (spilled a drink, minor back talk, sibling squabbles). It hurt and while it didn't scar me it did effect me for a long time.
There is a definite difference between what my mom did and what my step dad did. As with anything, it isn't black and white. Not all hitting or physical discipline is necessarily abuse. Which brings me to my final statement:
3. In the county that I grew up in and in the county I live now, Children and Youth Services condones spanking as defined as hitting between the lower back and upper thighs (butt) with an open hand that does not leave marks for any period of time. Anytime any device is used (belt, spoon, extension cord, etc), marks are left, or it is anywhere other than the butt it is considered abuse. To be honest, I'm not sure why the body part getting hit matters that much, but it does. Perhaps it has something to do with having more fat/cushion there so as to reduce pain or something?