I believe that it its a little difficult, for me at least, to not smile and be social. Because for me, the up and coming social climber, I need to be very friendly and outgoing. Another problem I have is that I need to be very energetic and happy to get my funny on, I need to activily participate, I can't just hang back(yet!) and be funny or think of stuff to say because my natural tendencies for 16 years was to just be sorta mean and sarcastic, I was pretty funny but not fun around girls and some people because my mind was not open but now I realized that I have to get happy to be fun(duh!).
with that said, I think that for social climbers it is more difficult to NOT SMILE AND SUCCEED than otherwise. But more important than smiling is being different because the same isn't noticed; I think that people should comecentrate there personality. All this stuff applies, unless your really good looking and people notice you without smiling+personality! once you are the center of attention (aka popular) then you don't have to smile much, but you gots to get there first.