I'm mostly active on reddit (reddit profile), but also on the steam forums (steam profile) and on the paradox forum. I mostly help people with technical problems and question about how the game works. The fastest way to contact me is to write me a PM on the forum.
On the wiki I try to correct errors and add information which can be derived from the game files. I would also be interest in automating more of it, so that lists and similar content can be updated faster.