America's top four Internet companies, Google, Yahoo, AOL and Microsoft's MSN, promise they will protect the personal information of people who use their online services to search, shop and socialize. But a close read of their privacy policies reveals as much exposure as protection. The massive amounts of data these companies collect, which can include records of the searches you make, the health problems you research and the investments you monitor, can be requested by government investigators and subpoenaed by your legal adversaries. But this same information is generally not available to you."