IRONICALLY, HUMANS NOW ENJOY MORE privacy than ever, says Aaron Ben-Ze'ev, president of the University of Haifa and author of Love Online: Emotions on the Internet. "Two hundred years ago, when people lived in villages or very dense cities, everyone's behavior was evident to many and it was extremely hard to hide it," he says. Today, e-mail and "chatting" online allow for completely anonymous interactions. We can talk and make plans without the whole household or office knowing. But if we're so able to keep things to ourselves, then why are we doing exactly the opposite?