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Weight-loss product advertisers may not want their advertisement to appear to users that are very happy. Because, a person that is really happy, is less likely to purchase a self-investment product that leverages on his or her shortcomings. But a really happy person may purchase electronic products or vacation packages. No club or party advertisers want to appear when the user is sad or crying. When the user is emotionally sad, advertisements about club parties would not be appropriate and may seem annoying or negative to the user. Online help or technical support advertisers want their advertisements to appear when the user is demonstrating a confused or frustrated emotional state.
— from Microsoft’s patent application to build an Emotional State Database from information gleaned from Kinects, webcams, online games, IMs, email, searches, webpage content, and browsers
