The difference is that Facebook Google and Twitter are intentionally blocked by the Chinese government. They would kill to have access to China if they could. 11W on the other had unintentionally blocked themselves by putting in a security measure that doesn't work the way it should.
I realize that while China is 25% of the world its not 25% of your subscriber base. However I'm also sure that I'm not the only one this impacts. Several other users have reported the same issues from China, and those are only the ones who have been able to get to a VPN and bothered to report their complaints. I know personally it took me more than a week from when the site went out to when I brought this up here because I had to wait to get to my work computer with VPN access to get around the block., I bet there are many others having the same issue that just haven't been able to voice the problem.