There is some hair growth on the back and shoulders- at least for the average person. Race and genetics play a large part of course. The friends I have who have really sparse hair growth in that area- like clumps and fits, typically shave or wax it off so they are perfectly smooth. I have friends who are fairly hirsute and they leave it as is.

Personally I have a tiny growth there- basically just a general light fuzz. I leave it as is since it is not really visible or noticeable.