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Yahoo on Wednesday announced a new data-retention policy, but on Thursday privacy experts were still scratching their heads about what the policy really means.

Although it appeared Yahoo was setting an industry standard for data retention with a promise to anonymize user log data within 90 days (with limited exceptions for fraud, security and legal obligations), privacy advocates say the announcement isn't clear.

You've been browsing the Internet lately for information about carbon emissions to help your daughter with her climate change project at school.

You've also done a little shopping in advance of the holidays, buying that more-than-you-really-wanted-to-pay-for digital camera for your spouse.

Now, instead of that usual Staples banner ad on the online site of your local newspaper, you are getting ads about hybrid cars and high-definition TVs.

Google's biggest threat may not be Microsoft or Yahoo.

No, one of the most formidable challenges facing Google is likely sitting in your pocket or purse. It's your cell phone, and it will put added pressure on Google and other Internet companies to revamp the way they handle online marketing.

Google's biggest threat may not be Microsoft or Yahoo.

No, one of the most formidable challenges facing Google is likely sitting in your pocket or purse. It's your cell phone, and it will put added pressure on Google and other Internet companies to revamp the way they handle online marketing.