Less than a month after announcing a controversial new privacy policy that shares user data across all its sites with no opt-out option, Google is introducing a system to monitor all online activity of those who participate in a program called Screenwise. In exchange for unrestricted access to information on your every online move, the search and software giant is offering financial compensation.

By signing up for Screenwise and installing a browser plugin (only Google Chrome is supported at present), you'll be given...