I have signed up to a bunch of relevant Facebook groups as step #2.
I'm not sure if that alone is a good start for building an audience/list/brand. So I'm contemplating Twitter and a few forums too. Of course this means spreading time across more media.
Can you guys advise on whether Twitter is worth it for the online marketing niche?
Also, are there any others you would consider? Google + is in mind as well though I know little about it.