Read The Fine Print Before You Use Microsoft's Viral Age-Guessing Tool

If you let Microsoft's viral tool guess your age, you also let Microsoft use your photo for its "Internet businesses."

Microsoft's How-Old.net tool, which guesses a person's age and gender based on a photo of their face, became a viral hit despite (or, more likely, because of) its comically spotty accuracy. But before you submit your own photo, check the fine print: Your face could end up in a future Microsoft advertisement, Twitter user @Waldo points out.

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