A boycott app for the Hong Kong democracy movement

"Whatsgap was originally developed to help users find arcade machines, said its creator, Ken Leung. But before it launched in August, he expanded the app's functions, using black to denote establishments that are believed to be pro-government and yellow to identify those seen as supporting the protests.

Mr. Leung, 28 years old, said he wanted to help people save time when researching shops online. The app has been downloaded about 200,000 times, he said.

Mr. Leung said his team of three at first added each shop to the map one by one based on users' suggestions. Now, users vote on a restaurant's classification before it is added to the map."