Musical.ly, the video app popular with teenagers, was acquired in November by Chinese news aggregation giant TouTiao for a whopping sum in the ballpark of $US800 million ($1 billion). What does TouTiao plan to do with its expensive purchase? According to a planning document provided to Gizmodo, one of Musical.ly's initiatives under new management may be a riff on HQ Trivia, codenamed Project F.