Google, long a source of concern for privacy advocates worried about the publication of personal search histories, announced yesterday that it would start anonymizing those records 18-24 months after the searches are made. But privacy advocates have mixed feelings about Google’s efforts, reports the New York Times. Google’s privacy practices came under some scrutiny last year when an error at AOL caused personally identifiable search data to be released online. At that time, Google CEO Eric Schmidt promised data breaches would never happen at Google, only to be proven wrong this January when Google accidentally released some users’ banking data.