Physical looks are how people determine who they want to get to know better. Personality determines how much we care to know.
The Internet has allowed us to meet people we've never seen and get to know them by personality alone but that is relatively new, evolutionarily speaking. We are wired to pick out potential mates buy physical characteristics.
Most of the time it is looks, but if I want to date someone then they have to have the personality to go with it. I can meet a really hot guy, but then I find out he's an a**hole so I wouldn't want him. Looks are what attract people first... I think that goes with most people.