Anecdotally: it isn't just proximity to mainland China. It's proximity to China and the West. Depending on what social groups you run in, you're more likely to

Anecdotally: it isn't just proximity to mainland China. It's proximity to China and the West. Depending on what social groups you run in, you're more likely to use both facebook/tumblr/etc and/or Chinese social networks. A lot of people I know had Line, but most of them didn't really use it for messaging-- just the games, especially TsumTsum.