People say that New Yorkers aren't friendly, but I think they're more friendly than Londoners. Here there is a front-footed nature of Americans. You can go out on a night out and meet 10 random people and stay in touch with them, whereas that's not going to happen in the same way in London.
I live in New York, and I love New York as well, but I think Los Angeles is a place where if you have the right person with you, there are all these little worlds that you would never guess by just looking at the exterior of what the city is.