you can semi promote on Nexon forums and other forums but you cant just go and make an official thread. You have to be sneaky 8D.
Like lets say everyone is talking about something...you can just go wander in "oh well my friend from /ggftw *make sure you make that word links back to this section* said blah blah and blah blah" or you post a SS thread and say "me and my friends from /ggftw accomplished this and this today". You can also write comments like that on the FB page as soon as they get posted.
As for making this section active with current members you all just have to post more. More guides. More questions (you might already know the answer but who knows maybe someone else has the same question).