there's another site called travbuddy which I met a few people off the first time I went there
It all depends on how much cash you have
I'm coming over to BBK in early March and have been doing a bit of looking around in anticipation of needing friends when I get over there! There are loads of groups on the Meet Up website that take place in Bangkok and seem worth a go. If you're female there's also ChickyNet, a forum for ex-pat women to chat, pass in information and arrange meet ups etc.
Hope that's useful and good luck for January! Maybe I'll see you on the other side!