Tapatap is a US-based startup with an interesting spin on the social networking phenomenon. The best way I can describe it is like Flickr meets Am I Hot Or Not?, since the idea is to create 'contests' where you and friends upload photos and then rate each others' to decide which is best.
Tapatap also runs its own contests, often sponsored by companies who offer prizes to the best-rated photos. It's got a decidedly US college student focus (suggesting "Who's the hottest girl in our dorm?" as a possible contest), but it's an intriguing idea that spans PC and mobile phones.
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