theodp writes "Google and Facebook are warning legislators of dire consequences if California passes a 'do-not-track' bill. The proposed law would require companies doing online business in the Golden State to offer an 'opt-out' privacy mechanism for consumers. Senate Bill 761 'would create an unnecessary, unenforceable and unconstitutional regulatory burden on Internet commerce,' reads the sky-is-falling protest letter bearing the stamp-of-disapproval from Google, Facebook, Yahoo, Amex, Acxiom, Experian, Allstate, Time-Warner, MPAA, ESA and others. 'The measure would negatively affect consumers who have come to expect rich content and free services through the Internet, and would make them more vulnerable to security threats.'"
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