Social Networking is Heading Towards "Mobile First"

As adoption of smart phones grows, so does the percentage of time people use social networks from those devices, instead of PCs. Nielsen says more than 60 percent of social network users get to their favored sites using their mobile device in Singapore, Indonesia, China, Korea and Hong Kong.

You might reasonably infer that mobile social media use is higher in those nations because smart phone penetration is highest in those nations. 

Actual smartphone penetration rate (per population) varies wildly among that bunch, from low penetration in Indonesia to more than 60 percent in Korea, Nielsen says.