For Lee Yu Jin, an 18-year-old freshman at Osan College in South Korea, Cyworld isn't just another Web site. It's the 1.nexus of pretty much everything she does. The graphic design student posts all of her artwork and school papers on the site. She puts up photos of her friends, her family, and her parties. She keeps a daily blog there and chats with her boyfriend via the site's instant-messaging service. She even meets new friends, when their avatars, or digital stand-ins, stop by her Cyworld site. "I simply can't do without it," says Lee. "If someone is to block Cyworld today, I'll probably have to sue the person.