Plain Vanilla's QuizUp application is growing at a pace of 130,000 organic downloads a day. Since its release Nov. 7, the app that allows users to play against strangers and friends has racked up 3 million users, crossing the million registered-user mark in just a week. The game is distinguished from others by allowing users to generate their own quiz topics, providing a social network within the game, and focusing on specific topics that users can get passionate about, CEO Thor Fridriksson says.

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