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SAN FRANCISCO (Reuters) - Facebook Inc is considering incorporating most of its 1 billion-plus members' profile photos into its growing facial recognition database, expanding the scope of the social network's controversial technology.
The possible move, which Facebook revealed in an update to its data use policy on Thursday, is intended to improve the performance of its "Tag Suggest" feature. The feature uses facial recognition technology to speed up the process of labeling or "tagging" friends and acquaintances who appear in photos posted on the network.
The technology currently automatically identifies faces in newly uploaded photos by comparing them only to previous snapshots in which users were tagged. Facebook users can choose to remove tags identifying them in photos posted by others on the site.
The changes would come at a time when Facebook and other Internet companies' privacy practices are under scrutiny, following the revelations of a U.S. government electronic surveillance program.
Facebook, Google Inc and other companies have insisted that they have never participated in any program giving the government direct access to their computer servers and that they only provide information in response to specific requests, after careful review and as required by law.
Facebook Chief Privacy Officer Erin Egan said that adding members' public profile photos would give users better control over their personal information, by making it easier to identify posted photos in which they appear.
"Our goal is to facilitate tagging so that people know when there are photos of them on our service," Egan said.
She stressed that Facebook users uncomfortable with facial recognition technology will still be able to "opt out" of the Tag Suggest feature altogether, in which case the person's public profile photo would not be included in the facial recognition database.
Facial recognition technology has been a sensitive issue for technology companies, raising concerns among some privacy advocates and government officials. Tag Suggest, which the company introduced in 2011, is not available in Europe due to concerns raised by regulators there.
Google's social network, Google+, also employs similar technology, but requires user consent. And it has banned third-party software makers from using facial recognition technology in apps designed for its Glass wearable computer.
Egan said Facebook was not currently using facial recognition technology for any other features, but that could change.
"Can I say that we will never use facial recognition technology for any other purposes? Absolutely not," Egan said. But, she noted, "if we decided to use it in different ways we will continue to provide people transparency about that and we will continue to provide control."
Facebook also amended its Statement of Rights and Responsibilities on Thursday, adding and tweaking the language so that members under 18 years of age are deemed to have affirmed that a parent or legal guardian has agreed to allow marketers to use some of their personal information in ads.
The language was the result of a recent court-approved legal settlement regarding its "sponsored stories" ads.
Reporting by Alexei Oreskovic; Editing by Lisa Shumaker