Passion may be the most overused word in Silicon Valley, but here it's unlikely to refer to romance. While the second-wave emigres may be socially savvy, the enthusiasm they bring to bear on their businesses is narrowly focused. Distractions, including relationships, are largely unwelcome.
Demographics don't help. According to the U.S. Census Bureau, single men outnumber single women in the Valley by almost 5,500. And even men who should have no problem attracting women--say, good-looking men worth millions of dollars--aren't dipping into the dating pool. Sabeer Bhatia, 31, the co-founder of Hotmail, made $200 million when he sold his company to...