Two consumer groups asked the Federal Trade Commission on Tuesday to create a "do not track list" that would allow computer users to bar advertisers from collecting information about them.

The Consumer Federation of America and the Consumers Union also urged the FTC to bar collection of health information and other sensitive data by companies that do business on the Internet unless a consumer consents.

The call echoed those of other privacy advocates who filed statements with the FTC on Internet companies' use of "behavioral advertising." That is the practice of tracking a computer user's activities online, including Web searches and sites visited, to target advertisements to the individual consumer.

In December, the FTC approved Google's purchase of advertising rival DoubleClick over the objections of some privacy groups.

At the same time, the agency urged advertisers to let computer users bar advertisers from collecting information on them, to provide "reasonable security" for any data and to collect data on health conditions or other sensitive issues only with the consumer's express consent.

In comments to the FTC on online behavioral advertising, advertisers made clear a strong preference for self-regulation rather than government dictates on how personal data are collected, what disclosures are made to computer users and how long the information is stored.

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