There's actually a few interesting stories there about how Facebook has been beating out quite a few of these regional networks in recent years. For example, they've unseated Mixi in Japan and Cyworld in South Korea:
There are quite a few interesting stories like that, about how certain regionally popular services seem to be losing popularity compared to their international competitors.
I think it is debatable whether it was Facebook or Line that unseated Mixi. Looking at how my Japanese friends use their phones I would say it was Line.
