A nice idea, though simply as a face recognition/memory tool, there might not be enough content to justify a full price release. Not sure it would really apply to the 15-17 demographic either, so not sure about DS being the platform of choice – it seems more like a pc or console game, where you have the power to draw complex scenes in realistic social environments – nightclubs, parties etc.
It could be part of a series of games for common social insecurities – an eye toy/microphone game for speaking in public would be another example.
Dave