China's popular selfie app developer Meitu made a muted debut on the Hong Kong stock exchange Thursday after the biggest IPO by a technology company in the city in almost a decade. Its flotation is seen as a barometer for interest among Hong Kong investors in new tech companies from the mainland. "For a lot of institutional investors, I think they want to follow this stock because it is one-of-a-kind in the market," said Hong Kong-based analyst Jackson Wong.