
Not in China, Myanma/Burma or VietNam
Thankfully the governments of these countries have wisely decided that their citizens need not waste their time on this web site although they can still Twit or IM.
We have our very own social site in VietNam and very popular it is too, if you can read and write Vietnamese.
There again, SMS/texting is busy, busy, busy (we have very, very cheap rates, here in VN).