The Internet is lighting up with warnings about Superfish, an adware program that came preinstalled on many Lenovo laptops in the past six months. Like a lot of the bloatware that comes on new computers, Superfish exists to help push advertising, not to serve any real consumer need. That would be annoying enough, but Superfish seriously undermines the user's safety, according to many security experts. Superfish is a piece of third-party software that Lenovo installed to, as it says in its apology to consumers, “enhance the shopping experience.” That means it's meant to help advertisers target potential customers. But security...