I moved from Seattle to SF and one big difference I noticed is that people are waaay friendlier here in SF than they were in Seattle. It's so much easier to get to know new people here. I think part of the reason for that is that almost nobody in SF is actually from SF. Everybody you meet grew up somewhere else, so people seem much more open to getting to know new folks. This is particularly true as a guy trying to meet girls. "Seattle Freeze" is a real thing.