There's Anders Sandberg, and this Google search brings up some stuff. Sandberg is also associated with a Swedish transhumanist organization that probably has folk interested in LW stuff in it.

If there are local LW readers, they might be students at Gothenburg university, or they might hang out with Piratpartiet. (The Finnish Piraattipuolue has a subset of LWers readers, I don't know how similar the Swedish one is.) Have you tried looking for forums or IRC channels of student associations for math, compsci, cognitive science or philosophy students at Gothenburg University or looked into Piratpartiet forums?