While the CSUN student population is very eclectic and bursting with variety, the social life, on the other hand, isn't as vast. However, socializing on campus is what you make of it. If you are involved in activities, like Greek life or other clubs, you will have a better time of meeting friends, but if you just stay at home and keep to yourself, well, then it will be more difficult. If you get out there, there are opportunities to find your own niche.
In terms of the people who are out there, there isn't a typical CSUN student because everyone comes from different parts of the country and the world. However, most students are friendly and welcoming to each other. You will find "Hollywood" types who put a lot of time into how they look, but you will also find people who couldn't care less. Because it's a commuter campus, it's generally not as cliquey as other schools can be, which is good. Population-wise, some students remark that there are a lot of Middle Eastern students on campus, in addition to Latinos. Also, there is a strong homosexual population. However, the campus is so diverse, that there is a match out there for everyone, gay, straight, or whatever. There just won't necessarily be a lot of relationships, though, as most students are mostly looking just to hook up.